P0740 honda accord 2001

P0740 honda accord 2001 DEFAULT
Hi lovehonda,

Here are the diagnostic procedures for the trouble code.

DTC P/ LOCK - UP CONTROL SYSTEM

NOTE: DO NOT perform this DTC test until all other DTCs have been repaired first.

1. Using scan tool, retrieve A/T freeze data. Clear fault codes and road test vehicle under same conditions freeze data was recorded. If fault code returns, go to next step. If fault code does not return, problem is intermittent, check transaxle and PCM connections.
2. Using scan tool, check for any other DTCs. If any other DTCs are present, repair those DTCs first, then recheck for DTC P/ If no other DTCs are present, go to next step.

3. Test line pressure. If line pressure is within specification, go to next step. If line pressure is not within specification, repair hydraulic system as necessary.

4. Test clutch pressure. If clutch pressure is within specification, go to next step. If clutch pressure is not within specification, repair hydraulic system as necessary.

5. Replace lock-up control solenoid valve/shift control solenoid valve "A" assembly. Turn ignition off and clear codes. Road test vehicle at over 50 MPH for more than one minute. Recheck DTCs. If P/40 returns, go to next step. If P/40 does not return, system is okay.

6. Replace A/T clutch pressure control solenoid assembly. Turn ignition off and clear codes. Road test vehicle at over 50 MPH for more than one minute. Recheck DTCs. If P/40 returns, go to next step. If P/40 does not return, system is okay.

7. Replace torque converter. Turn ignition off and clear codes. Road test vehicle at over 55 MPH for more than one minute. Recheck DTCs. If P/40 returns, replace transaxle and torque converter. If P/40 does not return, system is okay.

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Sours: https://www.2carpros.com/questions/honda-accordhonda-accord-code-ptorque-conveter-clutch-solenoi

P is one of the most common transmission trouble codes. It means that the Accord&#;s computer has detected that there is an issue with the torque converter clutch (TCC) solenoid circuit.  

 

P Torque Converter Clutch Circuit Malfunction

 

The TCC &#;locks&#; the drivetrain, which allows for a true mechanical connection between the transmission and the engine.  In effect, this allows an automatic transmission to function like a manual transmission at certain speeds and engine loads, and eliminates all slipping from the transmission.

 

P Honda Accord

 

P Symptoms:  Honda Accord

The symptoms of P vary greatly.  If the converter stays unlocked, it can be a nuisance.  If it locks when it shouldn&#;t be, that&#;s where it can get dicey.

 

The most common symptoms include:

  • Poor Gas Mileage-  If the converter is not locking at speed, the engine&#;s RPM&#;s will stay higher.  This decreases fuel mileage.
  • Stutters and Stalls-  This would be a symptom of the transmission locking when it should not be.  It feels exactly like when you need to downshift in a manual transmission.
  • Higher RPM on highway-  If the converter is not locking, it can lead to higher RPM on the highway.  This increases fuel mileage and makes the transmission operate at a higher temperature.
  • Service Engine Soon Light

 

Here&#;s a great video on diagnosing this code:

 

 

P Causes Honda Accord

There are many different things that can cause the P code.  Most of them are going to need an experts touch to diagnose.  

This list is presented with a combination of likely to cause the issue and repairability in mind first.  

Diagnosing Honda Accord P

Transmission Fluid

If there isn&#;t enough transmission fluid, the transmission will not be able to operate normally. There are many symptoms of low transmission fluid.  The most noticeable one is going to be the transmission slipping.  

If the transmission fluid is dirty or burnt, it can make the transmission behave in a way that is not normal and throw the P code.  Here&#;s a pretty good guide on transmission fluid color.

If the fluid is low or bad, replacing should be considered an urgent priority.  The good news is that transmission fluid and filters are cheap.

 

Wiring Issues

The wiring harness that goes to and from the transmission is one of the more vulnerable pieces of wiring on a vehicle.  Inspecting the harness for obvious signs of distress, checking the connection at the transmission itself, and finally a continuity test can go a long way in diagnosing your Accord.

 

TCC Solenoid

It is highly likely that the torque converter clutch solenoid (TCC) has gone bad.  But, jumping straight to this conclusion without inspecting the transmission fluid and wiring can cause a lot of undue headache.

 

Torque Converter

The torque converter itself or torque converter clutch can go bad and throw the P code. 

 

Problem in the Case

If the TCC seems to be functioning properly, it may be that the problem is in the transmission case itself.  It could be a valve body issue, a problem with the pressure going through the transmission, or a clogged filter.

 

Conclusion

Articles on this site are always written with the DIY enthusiast in mind.  Most of the time, you&#;re not looking these codes up for casual reading.  You&#;re looking them up to fix your vehicle.  We would never want to discourage that.  With that being said, P is a tougher code to diagnose and is often out of the range of the shade tree mechanic.  

If there is anything that you would like to add, please feel free to leave a comment.

 

Categories Honda AccordSours: https://wwwr4transmissionhq.com/phonda-accord/
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P HONDA Code - Transmission Lock-Up Control System Fault

AutoCodes - Honda - P HONDA

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What does this mean?

&#;P HONDA code possible causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty torque converter clutch solenoid valve
  • Torque converter clutch solenoid valve harness is open or shorted
  • Torque converter clutch solenoid valve circuit poor electrical connection

&#;How do I fix the P HONDA code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

&#;P HONDA code tech notes

On some Honda vehicles, the P code may be set by an overheating torque converter problem which is caused by an insufficient flow to the torque converter release circuit.













User Submitted Video

&#;Cost of diagnosing the P HONDA code

Labor:

The cost of diagnosing the P HONDA code is hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $ per hour.

&#;When is the P HONDA code detected?

Diagnostic trouble code P is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

&#;What are P HONDA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Transmission shift shock
  • Vehicle may not shift into the highest gear

&#;P HONDA code description

The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
OBDII Code P Honda - Transmission Lock-Up Control System Fault - AutoCodes.com

&#;Need more information with the P HONDA code?

Need more information on how to fix the P HONDA code?
Get Access to Factory Service Manuals

&#;P HONDA code comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P Honda code? Have you replaced any parts?
Any information is appreciated. Thanks

Top &#;

Repair Importance Level:3

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:3

 

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P HONDA Code - Transmission Lock-Up Control System Fault

Engine-Codes - Honda - P HONDA

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3  What is this?

What does this mean?

&#;P HONDA code possible causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty torque converter clutch solenoid valve
  • Torque converter clutch solenoid valve harness is open or shorted
  • Torque converter clutch solenoid valve circuit poor electrical connection

&#;How is the P HONDA code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

&#;P HONDA code tech notes

On some Honda vehicles, the P code may be set by an overheating torque converter problem which is caused by an insufficient flow to the torque converter release circuit.







User Submitted Video

&#;What is the cost to diagnose the P HONDA code

Labor:

The cost to diagnose the P HONDA code is hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $ per hour.

&#;When is the P HONDA code detected?

Diagnostic trouble code P is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

&#;What are P HONDA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Transmission shift shock
  • Vehicle may not shift into the highest gear

&#;What is P HONDA code meaning?

The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

&#;Need more information with the P HONDA code?

Need more information on how to fix the P HONDA code?
Get Access to Factory Service Manuals

Repair Importance Level:3

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:3

 

1=Easy 2=Moderate 3=Hard What is this?

Browse Codes for Specific Model-Year

Sours: https://www.engine-codes.com/p_honda.html

2001 accord p0740 honda

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EASY TESTING HONDA TCC SOLENOID,CODE PO740 (TORQUE CONVERTER CLUTCH SOLENOID)

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