P0A26: Generator Torque Sensor Circuit Intermittent

P0A26 points to short interruptions or jumps in the generator torque sensor signal rather than a constant fault. The control unit counts implausible signal changes or brief out-of-range events and sets the code once a calibrated limit is exceeded. Because the sensor works next to the generator, as in the Honda patent with a sensor in a hollow generator or motor shaft, heat cycles, vibration and inverter noise favour loose contacts and chafed wires. No manufacturer documents P0A26 publicly; CARB requires an approved generator monitor. Permanent faults show as P0A24 or P0A25. Symptoms often appear only on rough roads.

Symptoms

• Hybrid warning that comes and goes
• Brief drop in charging or system power

Most likely causes

• Loose or fretted terminal in the sensor connector
• Chafed wiring near the generator housing
• Shield or ground damage letting inverter noise in

What to check, in order

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

1. Measure the voltage with the engine off and running
2. Gently move the wiring with the engine running and watch whether the reading changes.
3. Clean and tighten the terminals
4. Check the accessory belt
5. Run a battery load test
6. Check the alternator wiring

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P0A26 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• A: Hybrid or air and fuel
• 26: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0A26?

If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.

What causes code P0A26?

The most common causes are: loose or fretted terminal in the sensor connector; chafed wiring near the generator housing; shield or ground damage letting inverter noise in.

Related codes

• P0A22Generator Torque Sensor Circuit
• P0A23Generator Torque Sensor Circuit Range/Performance
• P0A24Generator Torque Sensor Circuit Low
• P0A25Generator Torque Sensor Circuit High
• P0A21Motor Torque Sensor Circuit Intermittent

Sources

• patents.google.com: en
• law.cornell.edu: 13 CCR 1968.2

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.