P0737TCM Engine Speed Output Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- Some transmission modules pass an engine speed signal on to other devices such as a tachometer over a wire of their own. CARB requires output circuits to be checked. No manufacturer document available to us uses P0737–P0739 – engine speed is shared over CAN today; the description follows CARB and the engine module's own speed output (P0654), which sends, for example, two pulses per revolution. P0737 is the general circuit fault of this output; low and high are P0738/P0739. Not to be confused with the engine speed input at the transmission module (P0725 ff). A tachometer or dependent display then reads wrong or nothing, while driving is usually unaffected.
- What you may notice
- Tachometer or dependent display not working or wrong
- Warning lamp depending on manufacturer
- Usually no effect on driving
- Likely causes
- LikelyWire to the receiver open or shorted
- PossibleReceiver (e.g. instrument cluster) shorted internally
- PossibleConnector corroded
- RareDriver stage in the transmission module faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.