V8 Engine Misfire Condition

The Check Engine lamp may be illuminated and DTCs P0282 (Cylinder 8 Injector Control Circuit Low Voltage) and P0300 (Engine Misfire Detected) may be set on some 2015-2019 Escalade models equipped with the 6.2L V8 engine (RPO L86) and some 2015-2019 Suburban, Tahoe, and Yukon models equipped with the 5.3L V8 engine (RPO L83) or 6.2L V8 engine (RPO L86). The DTCs may be current or set in history. These conditions may be caused by a damaged wiring harness near the transmission bell housing. (Fig. 9)

Fig. 9

If performing the Service Information diagnostic checks does not isolate the cause of the condition, remove the intake manifold to inspect the #8 injector wiring area where the Bank 2 injector harness breaks out of the main engine harness. Check for hard contact with the transmission bell housing.

It may be necessary to remove the transmission crossmember, lower the transmission, and pull the wiring harness up into the engine compartment to locate the chafed wire.

At the branch of the harness, there will be a rub-through mark (Fig. 10) where the harness is chafing on the bell housing. Open the harness to repair the wiring as needed. (Fig. 11)

Fig. 10

Fig. 11

– Thanks to Tracy Lucas

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