P26B3

Code

Generic P — Powertrain

Fuel Shutoff Valve A Control Circuit Performance/Stuck Off

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 30 RU: 28

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Page language: EN

Causes

Open or shorted wiring to the fuel shutoff valve A
Corroded, loose, or damaged connector/terminal
Failed fuel shutoff valve solenoid (mechanically stuck or electrical failure)
Blown fuse or faulty fuel/relay circuit feeding the valve driver
PCM/ECM driver output fault or software/calibration issue
Contamination or debris preventing valve movement

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Engine cranks but does not start or starts intermittently
No fuel flow or fuel delivery cut off to one bank/section (depending on system)
Rough running, misfire, or stalling when valve fails to open
Sometimes stored readiness or system faults related to fuel delivery

What to check

Retrieve freeze frame data and stored freeze/frame PIDs using a scan tool
Confirm DTC P26B3 is current, pending, or historical and note any additional DTCs
Perform a visual inspection of the valve, connector, wiring harness, and grounding points for damage, corrosion, or disconnection
Check related fuses and relays for the fuel system/valve circuit
Use a DVOM to measure voltage and continuity at the connector with the connector disconnected (refer to signal parameters)
Command the valve ON/OFF with a factory scan tool (if available) to observe response and monitor control current/duty

Signal parameters

Typical coil resistance: commonly 5–50 ohms (manufacturer-specific; consult spec)
Supply voltage when commanded ON: battery voltage (~11–14 V) at the valve connector with engine off/ignition on
Control signal: either switched +12V or low-side ground driver (verify with vehicle wiring), or PWM duty-cycle when controlled by PCM
Expected response time: valve should move within 0.1–2 seconds of command (varies by design)
Idle/active current draw: typically hundreds of mA (measure in-circuit; excessive or zero current indicates fault)

Diagnostic algorithm

Read and record freeze frame data and all stored DTCs with a capable scan tool.
Perform a visual inspection: check valve body for contamination, check connector for corrosion/pin damage, and inspect harness for chafing or breaks.
Verify fuses and relays feeding the valve circuit; replace if blown or suspect.
Backprobe the valve connector with ignition ON (do not crank) and observe supply/control voltage while commanding valve ON via scan tool. Record voltages and compare to expected battery voltage.
Check coil resistance with the connector disconnected and ignition off. Compare resistance to manufacturer spec. If open or out of range, replace valve.
If resistance is within spec but valve does not operate, apply battery voltage briefly (use fused jumper) to the appropriate valve terminals to confirm mechanical movement. Do this outdoors or in a well-ventilated area and avoid sparks.
If valve responds to direct battery power but not to PCM commands, check continuity of control and supply circuits to the PCM and inspect grounds. Repair any wiring faults.
If the control circuit shows a short to ground or high resistance, isolate and repair the wiring or connector. Replace pigtails or repair harness as required.
If wiring and valve check good but issue persists, test PCM output driver for proper switching or PWM using oscilloscope or specialist scan tool. Consider PCM replacement only after exhausting wiring/valve checks.
Clear codes and perform a road/run verification after repairs. Re-scan to confirm no reoccurrence.

Likely causes

Valve solenoid internally failed or mechanically stuck off (contamination, seizure)
Open circuit in valve power or ground conductor (broken wire, connector terminal pulled out)
High resistance in connector or wiring causing insufficient voltage at valve
Short to ground on the control circuit when valve is commanded ON
Faulty fuse or relay supplying valve circuit