What causes fault code P053B?

• Most likely: Faulty PCV heater element (internal short circuit) • Likely: Wiring harness damage (short to ground in signal or power wire) • Possible: Defective PCV heater relay or blown fuse • Rare: Internal Engine Control Module (ECM) fault

Powertrain (Engine & Gearbox)Standard EOBD

P053B - Positive Crankcase Ventilation Heater Control Circuit Low

Q: What are the symptoms of fault code P053B?

• Check engine light on (MIL) • PCV system icing in cold climates (can cause oil leaks) • Increased condensation buildup in the oil system • Engine may run slightly rough in extreme cold conditions

Q: How do you fix fault code P053B?

STEP 1: Check the fuse for the PCV heater system and perform a visual inspection of the connector for corrosion. STEP 2: Measure the resistance of the heater element using a multimeter. Normal values are usually between 5-20 Ohms. Infinite resistance indicates an open circuit; 0 Ohms indicates a short. STEP 3: Verify supply voltage at the connector with the ignition on. There should be 12V (system voltage) against a known good ground. STEP 4: If the element is faulty, replace the PCV hose/heater assembly. Clear codes and perform a test drive.

Last updated:1 February 2026

Related:PCV Heater Element, Engine Control Unit (ECU), Fuse, Wiring

System

Powertrain (Engine & Gearbox)

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Technical Description

P053B is set when the Engine Control Module (ECM) detects an abnormally low voltage state in the Positive Crankcase Ventilation (PCV) heater control circuit. This heater is designed to prevent moisture from freezing in the PCV system during cold weather, which could otherwise lead to excessive crankcase pressure. The code typically triggers when the ECM monitors the feedback circuit and finds the voltage lower than the calibrated threshold, indicating a potential short to ground or a faulty heating element.

Possible Causes

Faulty PCV heater element (internal short circuit)

Wiring harness damage (short to ground in signal or power wire)

Defective PCV heater relay or blown fuse VIDA.

Internal Engine Control Module (ECM) fault

Symptoms

Check engine light on (MIL)

PCV system icing in cold climates (can cause oil leaks)

Increased condensation buildup in the oil system

Engine may run slightly rough in extreme cold conditions

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P053B - Positive Crankcase Ventilation Heater Control Circuit Low

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P053B - Positive Crankcase Ventilation Heater Control Circuit Low

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