Conditions for Clearing the 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.

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 non-emission related diagnostic.
Clear the DTC with a scan tool.

DTC P0236 (Federal RPO FE9, NG1)

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	Start the engine. Allow the engine to reach operating temperature. Turn OFF the ignition. Turn ON the ignition, with the engine OFF. Observe the BARO sensor pressure and the boost sensor pressure with the scan tool. Compare the values. Is the boost sensor pressure less than the BARO sensor pressure by more than the specified value?	10 kPa	Go to Step 9	Go to Step 3
3	Turn OFF the ignition. Remove the boost sensor from the intake manifold. Refer to Boost Sensor Replacement (Federal Emissions) or Boost Sensor Replacement (California Emissions) . Inspect for the following conditions: A plugged sensor port A damaged seal Did you find and correct the condition?	-	Go to Step 18	Go to Step 4
4	Turn ON the ignition, with the engine OFF. Connect a hand vacuum pump to the boost sensor port. Observe the boost sensor pressure on the scan tool as you SLOWLY apply vacuum 1 inch Hg at a time up to 15 inches Hg. Each inch of vacuum should result in a 3-4 kPa drop in pressure. Does the scan tool indicate the boost sensor is operating normally?	-	Go to Step 5	Go to Step 9
5	Disconnect the hand vacuum pump from the sensor. Does the scan tool indicate that the boost sensor pressure returns to the value observed in Step 2?	-	Go to Step 6	Go to Step 16
6	Inspect for the following conditions: A restriction in the air cleaner or the intake tube A leaking charge air cooler with a J 46091 charge air cooler tester Any leaking charge air pipes and connecting clamps and hoses A restriction in the exhaust-Refer to Restricted Exhaust in Engine Exhaust. A leaking intake manifold Did you find and correct the condition?	-	Go to Step 18	Go to Step 7
7	CAUTION: Refer to Safety Glasses and Compressed Air Caution in Cautions and Notices. Turn OFF the ignition. Remove the hose from the wastegate actuator tube. Apply compressed air, not exceeding 310 kPa (45 psi), to the actuator tube to open the wastegate. The wastegate should begin to open near 207 kPa (30 psi) and be fully open at 310 kPa (45 psi). the actuator rod stroke should measure near 4 millimeters (0.2 inch). Remove the compressed air from the actuator tube. Does the wastegate move to the fully extended position and return to the fully retracted position?	-	Go to Step 8	Go to Step 15
8	Remove the air intake pipe. Refer to Air Intake Pipe Replacement . Inspect for any condition that may cause poor turbocharger performance. Refer to Turbocharger Cleaning and Inspection in Engine Mechanical - 6.6L. Did you find a problem with the turbocharger?	-	Go to Step 15	Go to Intermittent Conditions
9	Disconnect the boost sensor electrical connector. Refer to Boost Sensor Replacement (Federal Emissions) or Boost Sensor Replacement (California Emissions) . Connect a test lamp to a good ground. Probe the 5-volt reference circuit of the boost sensor with the test lamp. Is the test lamp OFF?	-	Go to Step 11	Go to Step 10
10	Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the boost sensor and the signal circuit of the boost sensor. Does the scan tool indicate that the pressure is more than the specified value?	254 kPa	Go to Step 13	Go to Step 12
11	Test the 5-volt reference circuit of the boost sensor for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the conditions?	-	Go to Step 18	Go to Step 14
12	Test the signal circuit of the boost sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 18	Go to Step 14
13	Inspect for poor connections at the boost sensor. 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 18	Go to Step 16
14	Inspect for poor connections 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 18	Go to Step 17
15	Replace the turbocharger. Refer to Turbocharger Replacement in Engine Mechanical 6.6L. Did you complete the replacement?	-	Go to Step 18	-
16	Replace the boost sensor. Refer to Boost Sensor Replacement (Federal Emissions) or Boost Sensor Replacement (California Emissions) . Did you complete the replacement?	-	Go to Step 18	-
17	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 18	-
18	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 19
19	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