DTC 299

Possible Causes

• •Damaged or dirty TIP sensor
• •Damaged turbocharger compressor or turbine wheels
• •Damaged, dirty, or faulty MAP sensor
• •Dirty or damaged TIP and MAP sensors
• •Faulty MAP sensor
• •Intermittent fault
• •Loose hose clamps on CAC piping
• •Loose hose clamps on the CAC piping (at turbocharger compressor outlet, valley bridge, CAC core inlet/outlet, or throttle body inlet)
• •Loose, disconnected, or damaged wastegate actuator pressure lines
• •Sticking throttle body
• •Tears or holes in CAC piping silicone boots
• •Tears or holes in silicone boots on CAC piping
• •Turbo Wastegate sticking
• •Turbocharger compressor or turbine wheels not spinning freely
• •Wastegate actuator pressure lines disconnected, loose, or damaged and leaking
• •Weak cylinder (cylinders not contributing equally)
• •Weak engine cylinder (unequal cylinder contribution)

Suggested Actions

1. 1Inspect the turbocharger by removing the exhaust pipe from the turbine outlet of the slave turbo, and removing the fuel system and intake boot from the compressor inlet
2. 2Inspect turbocharger compressor and turbine wheels for damage and ensure they spin freely
3. 3Perform a spark kill test under 20% load to identify and diagnose the weak cylinder
4. 4Perform a spark kill test under approximately 20% load, monitor MAP for changes, and diagnose the weak cylinder
5. 5Remove, inspect, and clean the TIP and MAP sensors
6. 6Repair loose or damaged wastegate actuator pressure lines, clear fault and retest engine
7. 7Replace damaged CAC piping silicone boots, clear fault and retest engine
8. 8Replace damaged silicone boot(s), clear fault and re-test engine
9. 9Replace the MAP sensor currently installed on the master side if DTC 234 becomes active after swapping
10. 10Replace the MAP sensor currently installed on the slave side if DTC 299 becomes active
11. 11Swap MAP sensors between the master and slave sides, clear faults, and try to recreate the fault
12. 12Swap the master and slave MAP sensors, clear faults, run the engine, and check if DTC 234 becomes active
13. 13Tighten CAC piping hose clamps, ensuring the clamp is not located on the edge of the silicone boot or the pipe, then clear fault and test engine
14. 14Tighten hose clamps on the CAC piping, ensuring the clamp is not located on the edge of the silicone boot or pipe, clear fault and test engine

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