P26FF: Auto Configuration Throttle Input Not Present (Bank 2)

Some engine controllers set themselves up at power-on by checking which inputs are connected, so one module can serve several engine layouts. On V engines with a separate throttle body for each cylinder bank this includes a throttle position signal per bank. P26FF means the controller expects a throttle input for bank 2 but finds none during this self-configuration; P063E is the same finding for bank 1. Unlike circuit codes such as P0222/P0223, which judge a signal that is present but wrong, this one says the input was not detected at all. No manufacturer documents P26FF publicly. CARB requires throttle position inputs to be checked for wiring faults and for plausibility. Typical causes are an unplugged throttle body, an open signal wire or software meant for another engine; expect a reduced-power mode.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

• Check engine light on
• Reduced engine power or limp mode
• Poor throttle response or rough idle

Most likely causes

• Bank 2 throttle body connector unplugged or not fully seated
• Open signal, reference or ground wire to the bank 2 throttle position sensor
• Engine controller programmed or replaced with software for a different engine variant

What to check, in order

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

1. Check the pedal and throttle connectors
2. Use live data to confirm that both sensors rise smoothly and consistently
3. Clean the throttle if it has carbon buildup
4. Run the relearn procedure with the scanner if the manufacturer requires it
5. Replace the part identified by the diagnosis

Good to know

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

What each character of P26FF means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 6: Control modules and outputs
• FF: Specific fault in that system

Frequently asked questions

Can I keep driving with code P26FF?

Be careful: the car may suddenly lose power. If it goes into limp mode, get off the highway and calmly make your way to a repair shop.

What causes code P26FF?

The most common causes are: bank 2 throttle body connector unplugged or not fully seated; open signal, reference or ground wire to the bank 2 throttle position sensor; engine controller programmed or replaced with software for a different engine variant.

Related codes

• P063EAuto Configuration Throttle Input Not Present Bank 1
• P063FAuto Configuration Engine Coolant Temperature Input Not Present
• P2135Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

Sources

• law.cornell.edu: 13 CCR 1968.2
• en.wikipedia.org: Throttle position sensor
• en.wikipedia.org: Electronic throttle control

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.