P2077

P2077 is the bank-2 / sensor-B intake-manifold tuning valve position sensor 'range/performance' fault - the bank-2 IMRC actuator commanded position and the actual reported position diverge beyond tolerance. Because it's bank-specific, the diagnostic narrows to bank-2 hardware on V-engines: bank-2 IMRC actuator, bank-2 linkage, bank-2 position sensor. Cheapest-first ladder: (1) Visually inspect the bank-2 runner-control linkage on the intake - snapped plastic arms or seized flaps are still the dominant failure mode and a 5-minute hood-up check catches them. (2) Read live data for bank-2 IMRC commanded vs. actual; stuck actual with sweeping command = mechanical jam, sweeping actual that doesn't match command = sensor lying. (3) Swap bank-1 and bank-2 IMRC actuators if the design allows (some Ford 3-valve and some GM applications use identical left/right actuators) - if the fault follows the swapped actuator to bank 1, the part is bad; if it stays on bank 2, the harness or linkage is the fault. Expensive-misdiagnosis trap: replacing both actuators when only one is bad, or quoting an intake manifold when only the linkage clip is broken.

Vehicle-specific patterns: 2004-2010 Ford F-150 / Expedition with the 5.4L 3V Triton throws P2077 commonly alongside P2076 when the bank-2 IMRC linkage arm snaps - both arms tend to fail within 20k miles of each other, so quoting both sides at once is common shop practice on this engine. 2007-2013 Audi / VW 3.6L FSI VR6 (Touareg, Q7, CC) throws P2077 from a failed intake-flap motor on the bank-2 side. 2008-2014 Cadillac CTS / SRX / STS with the 3.6L LLT throws P2077 from intake-manifold runner-control actuator failure on the bank-2 (rear, on transverse mounting) side. 2003-2007 Nissan 350Z / Infiniti G35 with the VQ35DE throws P2077 from a stuck VIAS (Variable Induction Air System) actuator on the rear bank. Estimated repair: $120 to $850