Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

DTC P0299

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Turn ON the ignition, with the engine OFF. Monitor the DTC information with a scan tool. Is DTC P0045, P0046, P0652, P2563, P2564, or P2565 also set?	-	Go to Diagnostic Trouble Code (DTC) List	Go to Step 3
3	Observe the Boost Pressure Sensor parameter and the BARO parameter with a scan tool. Is the difference between the values more than the specified value?	3 kPa	Go to Step 12	Go to Step 4
4	Turn OFF the ignition. Remove the boost sensor from the intake manifold. Refer to Boost Pressure Sensor Replacement . Inspect for the following conditions: A plugged sensor port A damaged or leaking seal Did you find and correct the condition?	-	Go to Step 23	Go to Step 5
5	Connect the electrical connector to the boost sensor. Connect a J 23738-A Mityvac vacuum pump to the sensor port. Turn ON the ignition, with the engine OFF. Observe the Boost Pressure Sensor parameter with a scan tool. Slowly apply vacuum with the J 23738-A to the sensor until 10 inches Hg is reached. Does the Boost Pressure Sensor parameter decrease?	-	Go to Step 6	Go to Step 20
6	Observe the Boost Pressure Sensor parameter with a scan tool. Remove the vacuum from the sensor port. Does the Boost Pressure Sensor parameter return to the value observed in Step 3?	-	Go to Step 7	Go to Step 20
7	Inspect the following components: Inspect the air cleaner element for the following conditions: Excessive dirt Debris Water saturation Inspect the air intake duct for a leak or restriction. Did you find and correct the condition?	-	Go to Step 23	Go to Step 8
8	Test the charge air cooler and connecting pipes and hoses for air leaks using the J 46091 Charge Air Cooler Tester. Did you find and correct the condition?	-	Go to Step 23	Go to Step 9
9	Inspect the exhaust system for the following conditions: Leaks between the exhaust manifolds and the turbocharger-Refer to Exhaust Leakage in Engine Exhaust. Restrictions-Refer to Restricted Exhaust in Engine Exhaust. Aftermarket parts Did you find and correct the condition?	-	Go to Step 23	Go to Step 10
10	Remove and inspect the turbocharger for wear or damage. Refer to Turbocharger Replacement and Turbocharger Cleaning and Inspection in Engine Mechanical. Did you find a condition with the turbocharger?	-	Go to Step 22	Go to Step 11
11	Test for the following conditions: Charge air leaks between the following components: Air inlet tube Intake manifold tube Center intake manifold Left and right intake manifolds Left and right cylinder heads Head gasket failure-Refer to Engine Compression Test . Worn piston rings-Refer to Engine Compression Test . Repair as necessary. Did you find and correct the condition?	-	Go to Step 23	Go to Intermittent Conditions
12	Test for an intermittent and for a poor connection at the boost pressure sensor connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 23	Go to Step 13
13	Disconnect the boost pressure sensor. Measure the amperage between the 5-volt reference circuit and the low reference circuit, at the boost pressure sensor connector, with a DMM. Is the amperage more than the specified value?	170 mA	Go to Step 14	Go to Step 15
14	Connect a jumper wire between the 5-volt reference circuit and the signal circuit of the boost pressure sensor at the connector. Observe the Boost Pressure Sensor parameter with the scan tool. Is the pressure more than the specified value?	254 kPa (36 psi)	Go to Step 20	Go to Step 17
15	Disconnect the engine control module (ECM). Measure the resistance of the 5-volt reference circuit between the boost pressure sensor and the ECM, with a DMM. Is the resistance more than the specified value?	5 ohm	Go to Step 19	Go to Step 16
16	Measure the resistance of the low reference circuit between the boost pressure sensor and the ECM with a DMM. Is the resistance more than the specified value?	5 ohm	Go to Step 19	Go to Step 21
17	Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 23	Go to Step 18
18	Disconnect the ECM. Measure the resistance of the boost pressure sensor signal circuit between the boost pressure sensor and the ECM with a DMM. Is the resistance more than the specified value?	5 ohm	Go to Step 19	Go to Step 21
19	Repair the high resistance in the circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 23	-
20	Replace the boost pressure sensor. Refer to Boost Pressure Sensor Replacement . Did you complete the replacement?	-	Go to Step 23	-
21	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 23	-
22	Replace the turbocharger. Refer to Turbocharger Replacement in Engine Mechanical. Did you complete the replacement?	-	Go to Step 23	-
23	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Perform the turbocharger learn procedure. Refer to Turbocharger Learn Procedure . Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 24
24	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK