Powertrain, generic (extended)

P2E65 Engine Coolant Bypass Valve E Stuck/Open

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2E65 is a functional fault: the electrics of valve E are fine, but the valve remains open although it was told to close. The official title is written Stuck/Open, though it means stuck open, the partner of P2E67. No carmaker documents valve E publicly. GM shows the method on its block rotary valve D (P26C0): commanded and measured angle differ by 10° or more while the raw feedback sits at 50° or above, 4 of 5 seconds, Type A in the 2019 L3B tables. Without a position sensor, a Ford patent infers a stuck warm-up valve from coolant and transmission fluid temperatures before and after the command. GM bulletin 21-NA-149 adds that a chafed engine harness can trigger such valve codes. Open valves waste heat during warm-up.

Likely causes

Valve body jammed open by deposits or worn seals

Broken gear or weak actuator that cannot drive the valve closed

Position sensor or its wiring reporting an open valve that is actually closed

Chafed engine harness disturbing drive or feedback signals

Symptoms

Engine and cabin heat take longer to come up
Check engine light
Slightly higher fuel use on short trips

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€120–900

Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

engine coolant bypass valve ewiring harnessecm

Related codes

P2E67 P2E66 P26C0 P26AF P26BA

References: law.cornell.edu, gsi.ext.gm.com, image-ppubs.uspto.gov, static.nhtsa.gov.