Faulty heated catalyst power switch (integrated in the heating circuit) causing voltage mismatch.; Corroded or damaged wiring and connectors in the heated catalyst power circuit.; Weak or failing vehicle battery leading to inconsistent voltage supply.; Defective engine control module (ECM) voltage sensing circuit.; Poor ground connection for the heated catalyst system.; Aftermarket or incorrect battery installed, causing voltage fluctuations.

DTC codes / BMW codes / P1467

P1467 · BMWHeated Catalyst Comparison Battery Voltages of Power Switches Plausibility

P1467 on BMW vehicles indicates that the engine control module (ECM) has detected a plausibility error when comparing the battery voltage readings from the power switches of the heated catalytic converter system. The ECM monitors the voltage supplied to the heating elements via separate power switches and expects the two voltage signals to correlate within a calibrated range; when the difference exceeds the threshold, this code is stored.

SystemPowertrain

Code typeBMW specific

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light (CEL) on the dashboard.
Often no symptoms besides the warning light, as the heated catalyst may still function normally.
Possible slight decrease in fuel economy if the catalyst heating is inhibited.
In rare cases, a noticeable sulfur or rotten egg odor from the exhaust during cold starts.
Intermittent code setting that may clear after several drive cycles if the fault is voltage-related.
No drivability issues in most cases, but the vehicle may fail an emissions inspection.

Common causes, most likely first

Faulty heated catalyst power switch (integrated in the heating circuit) causing voltage mismatch.
Corroded or damaged wiring and connectors in the heated catalyst power circuit.
Weak or failing vehicle battery leading to inconsistent voltage supply.
Defective engine control module (ECM) voltage sensing circuit.
Poor ground connection for the heated catalyst system.
Aftermarket or incorrect battery installed, causing voltage fluctuations.

How to diagnose and fix it

Perform a battery load test and verify charging system output; replace battery if it fails.
Inspect all wiring and connectors between the ECM, power switches, and heated catalyst for corrosion or damage.
Check and clean ground connections for the heated catalyst circuit.
Use a multimeter to measure voltage at each power switch and compare readings to specifications.
If voltage discrepancy is confirmed, test the power switches individually and replace faulty components.
Clear the code and perform a drive cycle to verify if the code returns.
If the code persists after all external checks, diagnose the ECM for internal faults.

Voltage Mismatch Isn't Always the Switch

A weak battery is a common culprit that is often overlooked because the engine still starts and runs normally.
Corroded ground points can cause voltage drops that mimic a failed power switch, so always check grounds first.
The code may set intermittently due to temperature-related resistance changes in the wiring harness.
Replacing the heated catalyst without diagnosing the power switch circuit is an expensive misdiagnosis.
Some aftermarket batteries have different internal resistance, leading to voltage plausibility errors that disappear with an OEM battery.

Can I keep driving with P1467?

The vehicle is safe to drive with this code because it does not affect engine performance or safety systems, but avoid ignoring it long-term as it may prevent the heated catalyst from functioning optimally and could lead to emissions test failure.

Tools that help

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Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.