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I am working on a 2003 Yukon with a 4.8 in it. I keep getting a p1518 which throws it into reduced engine power. It won't go over 1k rpms while in this mode. The owner has already put a new throttle body on. I changed the throttle body computer to the one off my truck and it still got the code. I did find that the engine was loosing its ground so I added another ground strap. Also checked power from the ect fuse to the throttle body computer and had battery voltage. It is still throwing this code. Any help would be great. I don't know were to go from here.
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DTC P1518 sets if the battery voltage is low. If the customer's concern is slow cranking or no crank because battery voltage is low, ignore DTC P1518. Clear any DTCs from memory that may have set from the low battery voltage condition.
DTC P1518 sets when there is a short to B+ on the TAC module ground circuit. Inspect the fuses for the circuits that are in the TAC module harness, i.e., cruise, brake. An inspection of the fuses may lead you to the circuit that is shorted to the TAC module ground circuit.
DTC P1518 sets if the TAC module ignition feed circuit is shorted to a B+ supply circuit. The TAC module stays powered-up when the ignition is turned OFF. When the ignition is turned ON, the TAC module is powered-up before the PCM. DTC
P1518 sets because no communication is detected by the TAC module from the PCM. Inspect related circuits for being shorted to a B+ supply circuit.
Inspect the TAC module power and ground circuits and the TAC module/PCM serial data circuits for intermittent connections.
Inspect the TAC module connectors for signs of water intrusion. When this occurs, multiple DTCs could be set with no circuit or component conditions found during diagnostic testing.
When the TAC module detects a problem within the TAC system, more than one TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC InfoRing and pinion specialistComment
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