What does Dodge P0138 mean?

Dodge code P0138: HO2S12 High Voltage. It relates to the O2 / lambda on Dodge vehicles.

Can P0138 be turned off in the ECU?

DTC removal is possible for off-road/motorsport use after the underlying fault or hardware change (e.g. DPF/EGR removal). Safety-critical codes should be fixed, not suppressed.

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Dodge • O2 / lambda

Dodge P0138

HO2S12 High Voltage

What P0138 means on a Dodge

On Dodge vehicles, P0138 is logged when the ECU detects a fault in the O2 / lambda: “HO2S12 High Voltage”. P0138 is a generic SAE code — see the universal P0138 page too.

Common causes & symptoms

Typical triggers for a O2 / lambda code like P0138 include faulty or ageing sensors, wiring/connector faults, a clogged or removed component, or a value drifting outside the ECU's expected window. Symptoms range from a check-engine light only, to limp mode, rough running, higher consumption or failed emissions tests.

P0138 and ECU tuning

When a Dodge has had hardware changed for off-road/motorsport use (for example a removed DPF or EGR), the related monitor must be disabled in the ECU map or the code re-appears. Softechpro Solutions performs DPF/EGR/AdBlue/DTC off and recalculates the checksum, so codes like P0138 stay cleared after the flash. Genuine faults should always be repaired, not just hidden.

Related Dodge codes

P0442 P0455 P0601 P1105

Need to clear P0138 after a delete?

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