P0321: Ignition or distributor engine speed signal out of range
The ECU is getting an engine speed signal from the ignition that does not add up. Usually the sensor, its wiring or the distributor is to blame.
| Code | P0321 |
|---|---|
| System | Engine and transmission |
| Group | P03xx, Ignition and misfires |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0321 means
The ECU needs to know engine speed to time fuel injection and the spark. On cars with a distributor or ignition module, that signal comes from there. This code means the signal is arriving, but with odd values or jumps that do not match what the engine is doing.
Most common causes
- Loose, dirty or corroded connector at the sensor or distributor
- Chafed wiring or interference from nearby spark plug leads
- Worn engine speed sensor or distributor pickup
- Dirty or damaged reluctor ring or pickup teeth
- Faulty ignition module
Symptoms
- Jerking or hesitation when accelerating
- Unstable idle
- Engine occasionally stalls
- Harder starting than usual
Can you drive with P0321?
With care You can drive carefully, but the engine may cut out on the move. Get it checked soon.
Open the bonnetthe in-depth explanation
How to check it
With a scan tool, watch live rpm at idle and while revving: if the figure jumps sharply or briefly drops to zero with the engine running, the signal is dropping out.
How to read and clear P0321 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0321 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P031D The ignition control signal D has a broken or disconnected wire
- P031E The ignition control signal D gives a lower signal than normal
- P031F The ignition control signal D gives a higher signal than normal
- P0320 Engine speed input (ignition or distributor): circuit fault
- P0322 No ignition or distributor engine speed signal
- P0323 The crankshaft position or engine speed sensor circuit fails intermittently
- P0324 There is a fault in the engine knock control system
- P0325 Knock sensor 1 circuit fault (bank 1 or single sensor)
- P0300 Random or multiple cylinder misfire
- P0301 Misfire detected in cylinder 1
- P0302 Misfire detected in cylinder 2
- P0303 Misfire detected in cylinder 3
What does code P0321 mean?
The ECU needs to know engine speed to time fuel injection and the spark. On cars with a distributor or ignition module, that signal comes from there. This code means the signal is arriving, but with odd values or jumps that do not match what the engine is doing.
Can you drive with P0321?
You can drive carefully, but the engine may cut out on the move. Get it checked soon.
How do you clear P0321?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0321 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
