P2D13

Code

Generic P — Powertrain

Exhaust Flow Control Valve C Control Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 30 EN: 37 RU: 26

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Page language: EN

Causes

Broken or disconnected wiring (open circuit) between PCM and valve
Corroded or loose connector at the valve or PCM
Failed exhaust flow control valve (open coil)
Blown fuse or faulty relay supplying the valve circuit
PCM output driver fault

Symptoms

Check Engine Light (MIL) illuminated
Exhaust routing not switching (reduced or changed exhaust flow/noise)
Reduced performance or poor emissions control in affected modes
Possible diagnostic trouble codes related to valve control

What to check

Read and record DTC(s) and freeze frame data with a scan tool
Attempt to actuate the Exhaust Flow Control Valve C using a bi-directional scan tool and observe response
Visually inspect valve, harness and connectors for damage, corrosion, or disconnection
Check relevant fuses and relays for continuity and proper operation
Back-probe the valve connector to measure supply voltage and control signal with ignition ON and during commanded actuation

Signal parameters

Supply voltage: approx. battery voltage at the valve supply pin with ignition ON (verify actual vehicle spec)
Control signal: either switched ground or PWM from PCM; duty cycle 0–100% when variable
Coil resistance: typically a low resistance (example range 5–50 Ω depending on vehicle); an open circuit reads OL/infinite
Expected continuity between valve control pin and PCM control pin when harness intact

Diagnostic algorithm

Retrieve and record all active and pending DTCs and freeze frame data. Note vehicle operating conditions when code set.
Visually inspect the valve, mounting, vacuum/hose routing (if applicable), wiring harness, and connectors for obvious damage, corrosion, water intrusion, or disconnected terminals.
With ignition ON (engine off), back-probe the valve connector: verify battery voltage at the power feed pin and check for proper ground or control signal at the control pin. If no supply voltage, check related fuses and relays.
Use a multimeter to measure coil resistance across the valve coil terminals. An open reading (OL/infinite) indicates a failed valve coil—replace valve. Compare resistance to service spec if available.
Command the valve ON and OFF with a scan tool while monitoring control signal. If PCM commands but no signal is present at the harness, suspect harness/connector or PCM output failure.
Check harness continuity between the valve connector and PCM connector. Repair any open circuits or high-resistance connections found. Wiggle harness while monitoring for intermittent changes.
If supply and control wiring check OK and valve coil resistance is within spec but valve does not operate, bench-test or replace the valve.
If wiring and valve check OK but control signal absent from PCM, inspect PCM ground(s) and power, then consider PCM output driver fault and consult manufacturer's advanced diagnostics before replacing PCM.
After repairs, clear codes and perform a drive cycle or re-test. Confirm code does not return and system operates correctly.

Likely causes

Open or high-resistance harness between PCM and valve (pin damage, chafing, rodent chew)
Connector corrosion or pushed-out terminal at valve harness
Valve coil internal failure (open winding)
Blown/failed inline fuse or relay for valve circuit

Fault status

⚠️ Status

Exhaust Flow Control Valve C control circuit open — no continuity or control signal detected. Inspect wiring, connectors, fuse/relay, and valve coil; check PCM output if wiring and valve are good.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours