P0E80: Coolant Bypass Valve B Control Stuck Closed

P0E80 reports that bypass valve B has stayed shut although flow through it is requested. Stellantis gives the criterion for the Jeep Wrangler plug-in hybrid (2021 to 2023): the code sets once engine coolant and the inlet of the electric coolant heater differ by more than 40 °F, about 22 K. Its service case S2208000205 and bulletin 07-006-23 (cars built on 4 June 2022) trace this to hoses on the three-way valve that were fitted one port off; drivers notice a lit check engine light and at times no heat, and the fix is rerouting the hoses using the marks on the valve. On the 2022 to 2023 Pacifica plug-in hybrid, bulletin 07-008-23 blames a valve clogged by machining debris and replaces it. CARB covers such outputs under functional monitoring. P0E7F is the open counterpart.

Symptoms

• Check engine light
• Intermittent loss of cabin heat
• Electric mode may be disabled

Most likely causes

• Hoses at the three-way valve shifted by one port (Wrangler 4xe, bulletin 07-006-23)
• Valve blocked by machining debris (Pacifica Hybrid, bulletin 07-008-23)
• Valve B actuator seized in the closed position

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. Use the scanner to command the movement and compare the actual position with the requested one.
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 can trigger limp mode.
• It affects emissions.

What each character of P0E80 means

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

Frequently asked questions

Can I keep driving with code P0E80?

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 P0E80?

The most common causes are: hoses at the three-way valve shifted by one port (Wrangler 4xe, bulletin 07-006-23); valve blocked by machining debris (Pacifica Hybrid, bulletin 07-008-23); valve B actuator seized in the closed position.

Related codes

• P0E7FCoolant Bypass Valve B Control Stuck/Open
• P0E7ECoolant Bypass Valve B Control Circuit Range/Performance
• P0E7ACoolant Bypass Valve A Control Stuck Closed
• U063CLost Communication With Coolant Bypass Valve Actuator B

Sources

• static.nhtsa.gov: MC 10229771 9999
• static.nhtsa.gov: MC 10239945 9999
• static.nhtsa.gov: MC 10241108 9999

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.