P0738
TCM Engine Speed Output Circuit Low
P0738 is an OBD-II diagnostic trouble code meaning: TCM Engine Speed Output Circuit Low. Common causes: tcm malfunction, open or short circuit in the circuit. Estimated repair cost: $56–167.
Symptoms
- Incorrect gear shifting
- Delays when shifting gears
- Transition to emergency mode of operation of the transmission
- Check Engine light comes on
Causes
- TCM malfunction
- Open or short circuit in the circuit
- Bad contacts in connectors
- Wiring problems
- Engine speed sensor malfunction
How to Fix
- Check the engine output speed circuit for opens and shorts.
- Inspect connectors and contacts for corrosion or damage
- Test the TCM using diagnostic equipment
- Check engine speed sensor
- If necessary, replace the TCM or repair the circuit
Related codes
Error P0738 by Vehicle Brand
FAQ
What does the P0738 code mean?
P0738 is an OBD-II diagnostic trouble code that indicates: TCM Engine Speed Output Circuit Low
What causes a P0738 error code?
The most common causes of P0738 include: TCM malfunction; Open or short circuit in the circuit; Bad contacts in connectors; Wiring problems.
How do I fix a P0738 diagnostic trouble code?
To fix P0738: Check the engine output speed circuit for opens and shorts.. Inspect connectors and contacts for corrosion or damage. Test the TCM using diagnostic equipment. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0738?
Do not drive — repair immediately
How much does it cost to fix P0738?
The estimated repair cost for P0738 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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