P021D

Cylinder 10 Injection Timing

Q: Is it safe to drive with P021D?

Only briefly. Incorrect injection timing on cylinder 10 causes a misfire and power loss and can strain the engine. Repair it soon.

Q: Can I just clear P021D?

It returns until the injector, wiring, or timing-reference fault is fixed. Because it affects combustion, diagnose the cause rather than clearing it.

Fuel injection timing Generic OBD-II High

What it means

P021D means the fuel-injection timing for cylinder 10 is outside the expected window — the injection event is happening too early or too late (most relevant on direct-injection and diesel engines). The result is rough running, a possible misfire on that cylinder, reduced power, and harder starting. The cause is usually the injector, its wiring, or a crank/cam timing-reference signal.

High

Can I keep driving? Drivable but may run rough, lack power, or start hard as cylinder 10 misfires; repair soon to avoid a persistent misfire.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P021D scans

P0748in 94.7% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Rough running or misfire
Reduced power and hesitation
Harder starting

Common causes

Most likely first

Faulty cylinder 10 injector or its injection-timing controlLikely
Wiring fault in the fuel-injection control circuitCommon
Crankshaft or camshaft position sensor error affecting injection timingCommon
Less commonly, a powertrain control module (PCM) faultLess often

How to diagnose & fix

Work through it in order

Scan and read freeze-frame data to confirm the cylinder 10 injection-timing fault.
Inspect the injector and injection-control wiring for damage or a poor connection.
Check the crankshaft and camshaft position sensor signals, since they set injection timing.
Test the cylinder 10 injector and replace it if faulty, then clear and retest.

FAQ

Quick answers

Is it safe to drive with P021D?+

Only briefly. Incorrect injection timing on cylinder 10 causes a misfire and power loss and can strain the engine. Repair it soon.

Can I just clear P021D?+

It returns until the injector, wiring, or timing-reference fault is fixed. Because it affects combustion, diagnose the cause rather than clearing it.

Read & clear P021D yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX