P0737
TCM Engine Speed Output Circuit
- Severity
- Medium
- Driving
- Drivable — book it in
A fault in the circuit the transmission module uses to send engine speed information onward - to the instrument cluster, the engine module or another system. The transmission itself is generally unaffected; what fails is something downstream that was relying on that signal.
Possible causes
- CommonWiring or connector fault on the output circuit
- CommonCorroded connector at the transmission module
- PossibleFault in the module receiving the signal, loading the circuit
- PossibleFailed transmission control module output driver
- PossibleAftermarket equipment spliced into the circuit
What you might notice
- Rev counter reading wrong or dead
- Check engine light on
- Often no drivability symptom at all
What to check, in order
- Establish what actually uses this signal on the vehicle, then check whether that thing works. If the rev counter is fine, the fault is in the circuit rather than in what it feeds.
- Inspect the connectors at both ends of the circuit.
- Check the wiring for chafing and shorts.
- Ask whether aftermarket equipment - a rev limiter, an alarm, a performance gauge - has been spliced into this wire.
- Check for other transmission codes. This one rarely matters on its own.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission
P0700P0701P0702P0703P0704P0705P0706P0707P0708P0709P0710P0711P0712P0713P0714P0715P0716P0717P0718P0719P0720P0721P0722P0723P0724P0725P0726P0727P0728P0729P0730P0731P0732P0733P0734P0735P0736P0737P0738P0739P0740P0741P0742P0743P0744P0745P0746P0747P0748P0749P0750P0751P0752P0753P0754P0755P0756P0757P0758P0759P0760P0761P0762P0763P0764P0765P0766P0767P0768P0769P0770P0771P0772P0773P0774P0775P0776P0777P0778P0779P0780P0781P0782P0783P0784P0785P0786P0787P0788P0789P0790P0791P0792P0793P0794P0795P0796P0797P0798P0799