Mechanics

P740 TCC CIRCUIT MALFUNCTION

2004 Honda Odyssey

Transmission problem
2004 Honda Odyssey 6 cyl Two Wheel Drive Automatic 143000 miles

Hi there,

Got a p740 code with check engine light on. Apparantly this is a TCC Circuit Malfunction and happens alot with the Odyssey transmission. The transmission has since started slipping and cant drive the car above 30mph. I heard there is a solenoid that may have failed and is causing the issue, or with the transmission not working is it time to replace the whole thing? I checked the ATF level and it is a little low and dirty.

Thanks for any help!
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Cfal77
October 7, 2009.




Hello –

To better assist you is your model the EX or and what is the engine size in liter.

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ImpalaSS
Oct 7, 2009.
LX model, v6 3.5L
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Tiny
Cfal77
Oct 7, 2009.
Hello –

Okay…. Some data on this….

As for the code………. As you see below it doesn’t look too good……. But hold on until the end.

As you see in step 2 if the line pressure isn’t good you replace the transmission right off. Now if it is okay then it says to replace torque converter clutch solenoid valve.

Review below and then more after that.

DTC P0740: PROBLEM IN LOCK-UP CONTROL SYSTEM
NOTE: Record all freeze data and review General Troubleshooting Information (see General Troubleshooting Information) before you troubleshoot. Keep these replacement solenoid valves on hand: • Torque converter clutch solenoid valve.
• A/T clutch pressure control solenoid valve C.
1. Check whether the scan tool or the HDS indicates another code.
Does the scan tool or the HDS indicate another code?
YES - Perform the Troubleshooting Flowchart for the indicated code(s) Recheck for code P0740 after troubleshooting.
NO - Go to step 2.
NOTE: Do not continue with this troubleshooting until the causes of any other DTCs have been corrected.
2. Measure the line pressure (see Pressure Test).
Is the line pressure within the service limit?
YES - Go to step 3.
NO - Replace the transmission.
3. Replace torque converter clutch solenoid valve (see Torque Converter Clutch Solenoid Valve Replacement).
4. Replace A/T clutch pressure control solenoid valve C (see A/T Clutch Pressure Control Solenoid Valve C Replacement).
5. Clear the DTC with the scan tool or the HDS.
6. Using the scan tool, check to be sure that the engine coolant temperature is 176 °F (80 °C) or above.
7. Drive the vehicle under the same conditions as those indicated by the freeze data, or at 55 MPH (88 km/h) with very steady throttle for more than 1 minute.
8. Recheck for code P0740.
Does the scan tool or the HDS indicate code P0740?
YES - Remove the torque converter and inspect the O-ring. If the O-ring is missing, replace the O-ring. If the O-ring is damaged or OK, replace the transmission and torque converter.
NO - The system is OK at this time.

Okay…. Was looking at the TSBs…………as you see below it says if you get this code and it has more than 10000 miles most likely causing this DTC is low line pressure resulting from the inlet screen being clogged with clutch material. Then it says to fix this problem, refer to S/B 02-062.

When you look at that SB below……….

WARRANTY EXTENSION: ACCORD, ODYSSEY, AND PRELUDE AUTOMATIC TRANSMISSION
TECHNICAL SERVICE BULLETIN
Reference Number(s): 02-062, Date of Issue: January 5, 2007
HONDA: 1999-01 Odyssey; 2000-01 Accord; 2000-01 Prelude
CATEGORY: Transaxle
APPLIES TO: 1999-01 Odyssey - ALL; 2000-01 Accord - ALL; 2000-01 Prelude - ALL
Superceded Bulletin(s): 02-062, Date of Issue: October 1, 2004
Related Ref Number(s): 02-062
ARTICLE BEGINNING
BACKGROUND
In certain vehicles, a higher than normal number of automatic transmissions may have defects in material or workmanship that could cause premature wear or failure. To ensure that customers have adequate warranty coverage, American Honda is increasing the warranty on the transmission and the torque converter to 93 months (7 years and 9 months) or 109,000 miles, whichever occurs first.
CUSTOMER NOTIFICATION
The court sent a notification to all potentially affected customers in August/September 2006. The mailed notification was sent to original registered purchasers, and it informed them of the terms of the proposed settlement. A notice of the approved settlement also appeared in national newspapers and news websites.
CORRECTIVE ACTION
If standard diagnostics confirm an internal problem with the torque converter or the automatic transmission, replace the affected unit.

Now there is a little more to that – parts etc but I think it won’t apply to you since you have over the miles required.

But….I would still check with the dealer…. If there is no warranty then check with a couple of reputable transmission shops for some estimates……….

So you might be able to just have the screen cleaned with the material that is giving the low line pressure. Of course in the future the transmission may go for good…. But this is some options for now anyway.

Hope this helps.

Thank you very much for the donation

Please let us know if what the final fix was for your car so we can better assist others. Thanks!

Find a car repair manual for your car repair questions.

ImpalaSS
Oct 8, 2009.

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