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Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (5 Of 5)) >> Diagnostic Information and Procedures >> DTC P261F, P2B86, P2B87, P3077, P3078, U0623, or U137E >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different variant/trim than selected.

P261F 

Auxiliary Coolant Pump = Commanded state does not match the actual state - For greater than 8 s

P2B86, P2B87 

Auxiliary Coolant Pump Speed = Not within a calibrated range - For greater than 8 s

P3077, P3078 

Auxiliary Coolant Pump Speed = Not within a calibrated range - For greater than 4 s

U0623 

Serial Data circuit = Communication Failed - For greater than 2.5 s

U137E 

Serial Data circuit = Message Counter Incorrect - Control module that has set the DTC

The above condition(s) must occur 3 times.

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