Code Definition

P067B — Cylinder 4 Glow Plug Control Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P067B

P067B is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P067B is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P067B is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P067B code is set when the glow plug control module or engine control module detects an abnormally high voltage on the Cylinder 4 glow plug control circuit. On a diesel engine each glow plug is switched to heat its cylinder for cold starting and clean combustion, and the module monitors each control circuit. A high reading usually means the circuit is open, has high resistance, or is shorted to voltage, often from an open glow plug element or a poor connection at Cylinder 4. Symptoms can include harder or slower cold starting, rough running and white smoke just after a cold start, a glow p...

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