Broken, corroded, or disconnected wire in the control circuit between the PCM and the bypass valve; Failed coolant bypass valve solenoid or actuator (open internal coil); Corroded or loose electrical connector at the bypass valve; Faulty PCM driver for the control circuit (less common); Damage to the wiring harness from heat, vibration, or rodent activity

DTC codes / P2Exx · Hybrid propulsion / P2E62

P2E62Engine Coolant Bypass Valve E Control Circuit/Open

Q: What does code P2E62 mean?

Engine Coolant Bypass Valve E Control Circuit/Open. P2E62 indicates that the powertrain control module (PCM) has detected an open circuit on the control circuit for the engine coolant bypass valve 'E'. This valve manages coolant flow to help the engine reach operating temperature quickly and maintain optimal thermal conditions, and an open circuit means the PCM cannot command the valve to move.

P2E62 indicates that the powertrain control module (PCM) has detected an open circuit on the control circuit for the engine coolant bypass valve 'E'. This valve manages coolant flow to help the engine reach operating temperature quickly and maintain optimal thermal conditions, and an open circuit means the PCM cannot command the valve to move.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light (malfunction indicator lamp) with no other noticeable symptoms
Prolonged engine warm-up time or the engine never reaching normal operating temperature
Poor heater performance, especially at idle, due to insufficient coolant flow through the heater core
Slightly reduced fuel economy or increased emissions during cold starts
In rare cases, the engine may run hotter than normal if the bypass valve fails in a position that restricts coolant flow

Common causes, most likely first

Broken, corroded, or disconnected wire in the control circuit between the PCM and the bypass valve
Failed coolant bypass valve solenoid or actuator (open internal coil)
Corroded or loose electrical connector at the bypass valve
Faulty PCM driver for the control circuit (less common)
Damage to the wiring harness from heat, vibration, or rodent activity

How to diagnose and fix it

Use a scan tool to confirm the code and check for any related pending or history codes
Visually inspect the bypass valve connector and wiring for damage, corrosion, or looseness
Disconnect the valve connector and measure the resistance of the valve solenoid to check for an open coil
Check for battery voltage and ground at the valve connector with the key on, engine off, to verify power and ground circuits
Perform a continuity test on the control wire between the PCM and the valve connector to rule out an open circuit
If the circuit is intact, test the PCM output with a bidirectional scan tool or oscilloscope to confirm the driver is functioning
Replace the faulty bypass valve or repair the wiring as needed, then clear the code and verify the repair with a test drive

Don't overlook the wiring harness

A common oversight is replacing the bypass valve without first checking the control circuit for an open, which often lies in a hidden section of the harness near hot exhaust components.
The code can be set by a poor connection at the PCM connector, so always inspect and clean both ends of the circuit before condemning the valve.
On some vehicles, the coolant bypass valve is part of a larger coolant control module, and a failure in that module can set this code even if the individual valve tests good.
An open circuit in the control wire may be intermittent, so wiggle-test the harness while monitoring live data to catch a broken wire that only acts up under vibration.
This code does not always mean the valve is stuck; it specifically indicates an electrical open, so mechanical sticking would typically set a different code.

Can I keep driving with P2E62?

You can usually continue driving with this code, but avoid extended idling and monitor the engine temperature gauge; if the engine overheats or the heater stops working entirely, stop and have the vehicle inspected promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.