Home›Trouble Codes›P2669

P2669 — Actuator Supply Voltage B Circuit Open

Manufacturer-specificPowertrain (engine & transmission)

P2669 indicates that the PCM has detected an open circuit in the actuator supply voltage B circuit, which provides power to various engine actuators such as the EGR valve, variable valve timing solenoids, or turbocharger wastegate. When this voltage is missing, the affected actuators cannot operate correctly, leading to performance issues.

Symptoms

What causes it — most likely first

1. Open or damaged wiring in the actuator supply B circuit

A broken wire, chafed insulation, or severed trace in the harness supplying voltage B prevents the PCM from delivering power.

2. Corroded or loose connector at the actuator or PCM side

Oxidation, moisture intrusion, or improperly seated pins can interrupt the voltage path, causing an open circuit reading.

3. Blown fuse supplying actuator voltage B

If the fuse that protects this circuit opens, the PCM sees no voltage and sets P2669.

4. Failed actuator drawing excessive current or internal open

An actuator with an internal short or open can cause the PCM to detect an abnormal voltage condition, interpreted as an open circuit.

5. PCM output driver failure for actuator supply B (rare)

While possible, a faulty transistor or driver inside the PCM is uncommon; it should be considered only after wiring, connectors, fuse, and actuator checks are negative.

How it's diagnosed

  1. Identify which actuator(s) are powered by voltage B using the vehicle's wiring diagram or service information.
  2. Check the fuse for actuator supply B; replace if it is open.
  3. Visually inspect the related wiring harness and connectors for damage, corrosion, broken pins, or loose connections.
  4. With the key on and engine off, measure voltage at the actuator connector(s) for voltage B; it should read battery voltage (~12 V).
  5. Test the actuator's resistance or continuity according to specifications; replace if out of range.
  6. If voltage is present but the actuator does not operate, evaluate the PCM output using a scan tool or oscilloscope as a final step.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2660 — B Rocker Arm Actuator Control CircuitoP2661 — B Rocker Arm Actuator System PerformanP2662 — B Rocker Arm Actuator System Stuck BanP2663 — B Rocker Arm Actuator Control Circuit P2664 — B Rocker Arm Actuator Control Circuit P2665 — Fuel Shutoff Valve B Control Circuitop

Frequently asked

Do I need to replace the PCM for P2669?

PCM failure is uncommon for this code. Most cases are due to wiring, connectors, a blown fuse, or the actuator itself. Replace the PCM only after all other possibilities have been ruled out.

Can a blown fuse cause P2669?

Yes. If the fuse that supplies actuator voltage B is open, the PCM will detect an open circuit and set the code.

What symptoms might I notice with P2669?

Symptoms can include rough idle, reduced power, illumination of the check engine light, and specific actuator‑related issues such as the EGR valve not opening or variable valve timing malfunction.