P0BCD: Generator Inverter Temperature Sensor A Circuit Range/Performance

P0BCD flags a generator inverter temperature sensor A whose signal is electrically valid but does not fit the operating state, for example a value stuck at one temperature or far from the other temperatures after a long soak. Ford documents this exact code: on 2020 Lincoln Aviator 3.0L hybrids built up to 18 July 2020, P0BCD stored in the inverter system controller (SOBDMC) lights the MIL and is caused by software; the fix is reprogramming that module. Patents by Hino and Mitsubishi Electric describe how such checks work, comparing heat generated in the inverter with the measured temperature change or detecting a stuck sensor. Circuit faults go to P0BCE or P0BCF instead.

Symptoms

• Malfunction indicator lamp
• Often no noticeable change in driving
• Hybrid system warning message possible

Most likely causes

• Inverter controller software (Ford SSM 49120, Lincoln Aviator 2020)
• Sensor drifting or stuck at one value
• Uneven inverter coolant flow distorting the comparison

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Compare the reading with other engine data while varying the engine speed.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0BCD means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• B: Subsystem depends on the code range
• CD: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0BCD?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0BCD?

The most common causes are: inverter controller software (Ford SSM 49120, Lincoln Aviator 2020); sensor drifting or stuck at one value; uneven inverter coolant flow distorting the comparison.

Related codes

• P0BCCGenerator Inverter Temperature Sensor A Circuit
• P0BCEGenerator Inverter Temperature Sensor A Circuit Low
• P0BCFGenerator Inverter Temperature Sensor A Circuit High
• P0BD0Generator Inverter Temperature Sensor A Circuit Intermittent/Erratic
• P0DF4Generator Inverter Temperature Sensor B Circuit Range/Performance
• P0A3EGenerator Inverter Over Temperature

Sources

• static.nhtsa.gov: MC 10179180 0001
• law.cornell.edu: 13 CCR 1968.2
• patents.google.com: en
• patents.google.com: en

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.