P06ED code meaning
Engine RPM Output Circuit Low
What P06ED means
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.
P06ED at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P06ED
- Tachometer at zero or jumping
- Other modules without speed signal
- Engine runs normally
Common causes of P06ED
- Most likelySpeed output wire chafing against ground
- PossibleReceiver (instrument, add-on device) shorted internally
- PossibleAftermarket tachometer or accessory wired wrongly
- Less likelyEngine module driver stage
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine speed output circuitTachometerEngine control module
What each part of P06ED means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| ED | The exact fault in that area. |
What to do next
- Note P06ED and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P06ED
What does P06ED mean?
P06ED means "Engine RPM Output Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P06ED?
P06ED does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P06ED fail an emissions test?
P06ED is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P06ED to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P06ED clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.