P06EDEngine RPM Output Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- The engine module turns the crankshaft signal into a cleaned-up square wave for the tachometer, transmission or body-builder modules – Saab's 1999 9-3, for example, sends two pulses per revolution, about 30 Hz at idle. P06ED means this output is too low, typically shorted to ground, so it can no longer switch high. It is the counterpart of P0654 (open circuit) and P06EE (high). CARB requires output circuits to be checked; the signal is emission-relevant only if a receiving module uses it for emission functions. No manufacturer document available to us uses this code; the description follows CARB, the component and P0654. The tachometer then reads zero or jumps, and modules using the signal lose it, while the engine runs normally.
- What you may notice
- Tachometer at zero or jumping
- Other modules without speed signal
- Engine runs normally
- Likely causes
- LikelySpeed output wire chafing against ground
- PossibleReceiver (instrument, add-on device) shorted internally
- PossibleAftermarket tachometer or accessory wired wrongly
- RareEngine module driver stage
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.