P0E7D: Coolant Bypass Valve B Control Circuit High

P0E7D is stored when the line driving valve B sits above its expected level, for instance with the wire chafed against a powered line or a driver that cannot pull the circuit down. Stellantis names this code in the same software bulletins as its low sibling: 18-071-26 for the 2025 RAM pickup with Hurricane power, plus 18-082-26 (SO engine) and 18-083-26 (HO engine) for the 2025 Wagoneer and Grand Wagoneer. All of them require a lit check engine light, and the fix is a reflash of the engine control module, sometimes alongside oxygen sensor and airflow codes. Before replacing hardware it is therefore worth checking for such an update. CARB expects outputs like this to be checked for circuit faults. The low case is P0E7C, an open circuit P0E7B, a networked actuator that stops talking U063C.

Symptoms

• Check engine light
• Other stored codes after the same software issue

Most likely causes

• Outdated engine control software (Stellantis bulletins 18-071-26, 18-082-26, 18-083-26)
• Valve B control wire shorted to a voltage source
• Open circuit pulled high by the module input

What to check, in order

Start with the simplest. You can tick off each step.

1. With the engine cold, check the coolant level; never do this when the system is hot
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Check the actual temperature in live data
4. Make sure the fan comes on when it should
5. Check the thermostat and connector
6. Measure the sensor and replace it if its readings do not make sense

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P0E7D means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• E: Subsystem depends on the code range
• 7D: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0E7D?

Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

What causes code P0E7D?

The most common causes are: outdated engine control software (Stellantis bulletins 18-071-26, 18-082-26, 18-083-26); valve B control wire shorted to a voltage source; open circuit pulled high by the module input.

Related codes

• P0E7BCoolant Bypass Valve B Control Circuit/Open
• P0E7CCoolant Bypass Valve B Control Circuit Low
• P0E7ECoolant Bypass Valve B Control Circuit Range/Performance
• P0E77Coolant Bypass Valve A Control Circuit High
• U063CLost Communication With Coolant Bypass Valve Actuator B

Sources

• static.nhtsa.gov: MC 11038312 0001
• static.nhtsa.gov: MC 11038503 0001
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.