P0702 Mercedes-Benz Code - Transmission Control Module
Quick Answer
This Diagnostic Trouble Code (DTC) is set by the Engine Control Module (ECM) when you have a problem with the Transmission Control Module (TCM). Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0702 Mercedes-Benz indicates Transmission Control Module.
- Common causes
- Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0702 Mercedes-Benz Description
What are the Possible Causes of the DTC P0702 Mercedes-Benz?
- Faulty Transmission Control Module (TCM)
- Transmission Control Module harness is open or shorted
- Transmission Control Module circuit poor electrical connection
How to Fix the DTC P0702 Mercedes-Benz?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0702 Mercedes-Benz code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0702 Mercedes-Benz code?
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Frequently Asked Questions about P0702 Mercedes-Benz Code
1. What does the OBDII code P0702 mean for a Mercedes-Benz?
P0702 indicates a malfunction in the Transmission Control Module (TCM), responsible for managing the transmission's operation.
2. What are common symptoms of the P0702 code in a Mercedes-Benz?
Symptoms may include transmission slipping, failure to shift gears, limp mode activation, or the check engine light illuminating.
3. What causes the P0702 code in a Mercedes-Benz?
Common causes include wiring issues, a faulty TCM, low transmission fluid, or problems with related sensors such as the speed sensor.
4. Can I drive my Mercedes-Benz with the P0702 code?
Driving with the P0702 code is not recommended as transmission issues could worsen, potentially causing further damage or unsafe driving conditions.
5. How do I diagnose the P0702 code in a Mercedes-Benz?
Diagnose by scanning for trouble codes with an OBDII scanner, inspecting TCM wiring, checking transmission fluid levels, and testing related sensors.
6. How much does it cost to fix the P0702 code on a Mercedes-Benz?
Repair costs vary but can range from $200 to over $1,000 depending on whether the issue is wiring-related, sensor-related, or requires TCM replacement.
7. Can low transmission fluid cause the P0702 code?
Yes, insufficient or dirty transmission fluid can lead to improper transmission operation and trigger the P0702 code.
8. What should I do if my Mercedes-Benz goes into limp mode with the P0702 code?
If limp mode activates, check transmission fluid levels and scan for codes. Seek professional assistance promptly to avoid further damage.
9. Is replacing the Transmission Control Module always necessary to fix the P0702 code?
No, the issue may be caused by wiring, sensors, or fluid levels. Proper diagnosis is essential to determine if TCM replacement is needed.
10. Can a software update fix the P0702 code on a Mercedes-Benz?
In some cases, a software update for the TCM may resolve the issue if the problem stems from outdated programming.
Discuss the causes and fixes for P0702 Mercedes-Benz OBDII Code
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Mine was a $4,000 fix.... the dealership ran out of things and replaced the conductor shift plate,,, a $150 part was the problem all along
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I have a mercedes benz ml 430 2001 im to the point of giving up i have code P0702 and havent been able to fix it i changed the coils. Conductor plate and ring oil filter took it to a shop to clear transmission code paid 80 and no results also changed the transmission computer twise
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Hi Milo, took my slk32 to Mercedes Benz of San Antonio and the prognosis, after a $159.00 diagnostic, was that the valve body was bad and that it had to be replaced at a cost of $2,500.00.
I had an AutoZone diagnostic, an was informed that I had a PO702 code. In my case Limp Mode, transmission would not shift out of second gear.
I found a remanufactured valve body, thats all that's available for my vehicle, at genuinemercedes parts.com for $508.00 with core exchange. A much better price than the dealers remanufactured valve body at about $1,000.00.
The valve body includes the conductor plate and solenoids. I wanted to play it safe and have the job done right.
I also searched for a A.S.E mechanic. I found one that would install the conductor plate for $891.00, including transmission oil, part, and taxes. I'll have to call the mechanics garage and get a new estimate; because I will be providing the valve body part instead.
So I'm looking at a $1,400.00 repair bill. A savings of about $1,100.00 from the dealers quote.
I will probably have the transmission flushed as well.
Hope this helps.
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