P0EE4

Code

Generic P — Powertrain

A/C Refrigerant Distribution Valve B Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 35 RU: 28

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Page language: EN

Causes

Wiring open or high resistance in control circuit
Short to ground on control wire
Failed refrigerant distribution valve (solenoid/actuator)
Blown fuse or faulty relay supplying valve power
Poor connector contact or corrosion
Faulty PCM/BCM driver or internal electronics

Symptoms

MIL (Check Engine) illuminated with code P0EE4 stored
A/C performance degraded or valve-related function not operating
Erratic A/C operation (intermittent flow/diversion)
Related HVAC modes stuck or incorrect temperature distribution
Compressor cycling abnormally in some systems

What to check

Retrieve freeze-frame and all stored codes; note related A/C/HVAC codes
Visually inspect valve connector, wiring harness and nearby components for damage, corrosion, or water intrusion
Check relevant fuses and relays for the A/C valve power circuit
Backprobe valve connector with ignition ON and A/C request active to verify supply and ground presence
Measure valve coil resistance with connector unplugged and compare to spec
Use a lab scope or multimeter to check for a PWM control signal from PCM while A/C is requested

Signal parameters

Control signal: PWM 0–100% duty cycle (may be 0–5V or 0–12V depending on vehicle)
Typical PWM frequency: commonly 20–200 Hz (varies by manufacturer)
Expected coil resistance: typically 5–50 ohms (check vehicle spec)
Supply voltage (power pin): battery voltage ~12 V with ignition ON/A/C request
Ground continuity: near 0 ohms to chassis ground
Triggered low condition: driver output measured significantly below expected duty/voltage or open circuit

Diagnostic algorithm

Verify stored DTC P0EE4 and note any other related codes (HVAC/A/C, powertrain).
Confirm vehicle battery voltage is healthy (>12.2 V at rest) and charging system is functioning.
Perform a visual inspection of the valve B connector and harness for damage, corrosion, or contamination; repair as needed.
With connector disconnected, measure valve coil resistance; compare to service spec. Replace valve if coil is open or out of range.
Reconnect, backprobe the connector. With ignition ON and A/C request active, verify supply voltage on power pin (battery voltage) and good ground.
With A/C requested, observe control pin for correct PWM/duty cycle using an oscilloscope or duty-cycle-capable meter. If no control signal present, test upstream wiring and PCM output.
If control signal present but valve does not respond and coil resistance is within spec, check for shorts/opens between connector and PCM (wiggle harness while monitoring).
Check related fuses/relays and repair/replace if faulty. Verify connectors are seated and pins are not damaged.
If wiring, power, and valve check good but code returns, consider PCM/BCM driver fault and consult manufacturer procedures before replacing the module.
After repairs, clear codes and perform A/C system functional test to confirm the fault does not return.

Likely causes

Broken or chafed control wire between PCM and Valve B
Corroded or pushed-out connector at valve
Valve B coil shorted or open (internal failure)
Ground circuit of valve has high resistance or is disconnected
Supply fuse or relay for A/C valve circuit blown or faulty
PCM/BCM output transistor failed (less common)

Fault status

⚠️ Status

A/C Refrigerant Distribution Valve B control circuit low — low or missing control voltage/signal detected (possible open, short, bad ground, blown fuse, failed valve, or ECU driver fault).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours