P053A

PCV Heater A Control Circuit /Open

Q: Is it safe to drive with P053A?

Yes, in normal conditions. The PCV heater only prevents the crankcase ventilation valve from icing in cold weather, so everyday driving is unaffected. Repair it to clear the light and pass emissions.

Q: Can I just clear P053A?

It returns once the ECM re-checks the heater circuit unless the open/short or the heater element is repaired.

PCV / crankcase ventilation Generic OBD-II High

What it means

P053A means the ECM has detected an open (or an out-of-range voltage) in the control circuit for the positive crankcase ventilation (PCV) heater. That small heater keeps the PCV valve from freezing up in cold weather so crankcase vapours keep flowing. The fault is almost always in the heater element or its wiring. Everyday driving is unaffected, so it's mainly an emissions and check-engine-light concern, most relevant in cold climates.

High

Can I keep driving? Safe to keep driving in normal conditions — this is an emissions/cold-weather component, though it will keep the check-engine light on.

Real-world scan data

Seen in

109

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P053A scans

P2263in 45.9% 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
Usually no change in how the car drives
May fail an emissions test
In very cold weather, a frozen PCV valve could cause rough running (uncommon)

Common causes

Most likely first

Open or short to ground in the PCV heater control circuitLikely
Faulty PCV heater element / assemblyCommon
Open or short in the ignition-fed power (START/RUN) supply to the heaterCommon
Damaged or corroded connector at the PCV heaterLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and confirm the code with a scan tool.
Inspect the PCV heater's connector and wiring for an open or short.
Check that the heater has power and ground with the ignition on.
Measure the heater element's resistance against spec.
Replace the PCV heater assembly if the element or its circuit is faulty. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P053A?+

Yes, in normal conditions. The PCV heater only prevents the crankcase ventilation valve from icing in cold weather, so everyday driving is unaffected. Repair it to clear the light and pass emissions.

Can I just clear P053A?+

It returns once the ECM re-checks the heater circuit unless the open/short or the heater element is repaired.

Read & clear P053A 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