Truck Engine Fault

Truck Engine Check

Engine performance and reliability are concerns and engine problems are bigger than others, the vast majority can be avoided by regularly taking care of maintenance issues.

Diagnosing a fault with your engine is not always easy and it can be even harder to repair. If you believe that your engine is struggling or, worse still, failing, make sure you take a look at the nine most common issues relating to car engine failures below. Not all engine problems are serious and can be remedied relatively quickly, but all of them can cause engine breakdowns and, in the worst-case scenarios, require a brand-new engine.

We listed all truck brands with engine failure codes. Before that we shows common engine problems,causes and symptoms.


Truck panel error images
  • Engine overheat
  • Reduce coolant temp
  • DEF level low
  • Re-Fill DEF Tank
  • DEF tank near empty
  • Engine is derated Re-Fill DEF tank
  • DEF tank is empty
  • Before Re-Fueling Re-Fill DEF tank
  • Reduce engine revolution
  • Charging system error
  • Check generator belt
  • Engine oil pressure is low
  • Engine oil temp too high
  • Reduce engine oil temperature
  • Engine system malfunction
  • Communication line error
  • DEF tank is empty
  • Vehicle speed limited Re-Fill DEF tank
  • Insufficient DEF quality or failure
  • Engine is derated
  • Vehicle electrical system malfunction
  • PTO is in operation
  • Starter overheat
  • Transmission oil temp too high
  • ATM system error
  • DPF is regenerating
  • Auto engine shut down

Engine Troubleshooting

Engine List

Hatz engine logo

The product portfolio of the business fields of Hatz Diesel extends from small and compact single-cylinder diesel engines.

Hatz Engine Faults

Carolina Thomas engine logo

Carolina Thomas engines make it your bus with custom paint, wrap, logo, and decal branding options from our in-house body shop. You also have many comfort and convenience features to explore, such as under-seat heating, wheelchair lift systems, and much more.

Carolina Thomas Engine Faults

Deutz engine logo

The best way to keep your engine at peak performance is to rely exclusively on genuine DEUTZ parts and check problems with engine trouble codess.

Deutz Engine Faults

Caterpillar engine logo

View cat engine fault codes SPN CID SID or FMI directly from Caterpillar manuals, order published (new and legendary) operation & maintenance and parts manuals for your equipment.

Cat Engine Faults

Engine Error Abbreviations

APAccelerator position sensor
Along with other variables, the ECM uses the AP signal to determine injector oil-pressure, pulse width and timing. Supply 5.0V +/_ 0.5V, signal 0.5-0.7V at idle, 4.5V at wide open throttle.
BARO Barometric pressure sensor
The ECM uses the BARO signal to adjust fuel timing, fuel quantity, and glow-plug on-time during high altitude operation. Supply 5.0V +/_ 0.5V, signal 4.6V at sea level, decreasing at higher altitudes.
CMPCamshaft position sensor
The ECM uses the CMP signal to monitor engine rpm and tdc for Nos. 1 and 4 cylinders. This Hall-effect sensor generates a digital voltage signal of 12.0V high, 1.5V low.
DTCDiagnostic trouble code
EBPExhaust back pressure sensor
The ECM uses the EBP signal to control the exhaust pressure regulator (EPR). Supply 5.0V +/_ 0.5V, signal 0.8-1.0V @ 14.7 psi at idle, increasing with engine speed and load, decreasing with altitude.
EOTEngine oil temperature sensor
The ECM uses the EOT signal to control glow-plug on time, EPR, idle rpm and fuel delivery and timing. Supply 5.0V +/_ 0.5V, signal 4.37V @ 32 F, 1.37V @ 176 F, 0.96V @ 205 F.
EPRExhaust back pressure regulator
The EPR operates hydraulically from oil taken off the turbocharger pedestal mount. When intake air temperature is less than 37 F (50 F on some models) and the engine oil temperature is less than 140 F (168 F on some models) the ECM energizes a solenoid valve that causes oil pressure to close a butterfly at the turbo exhaust outlet. The valve opens under load and as the engine warms.
GPC Glow plug control
The ECM energizes the GPC relay for 10-120 seconds depending on engine oil temperature and barometric pressure.
IATIntake air temperature sensor The ECM uses the IAT signal to regulate exhaust backpressure. Supply 5 V+/_ 0.5V, signal 3.90V @ 32 F, 3.09V @ 68 F, 1.72V @ 122 F.
IPC Injection pressure control sensor
The ECM uses the IPC signal to match fuel delivery with load and to stabilize idle rpm. Signal 1.00V @ 580 psi, 3.22V @ 2520 psi.
IDMInjector driver module
The IDM receives cylinder-identification and fuel-demand signals from the ECM, and generates a 115 VDC, 10A signal for the appropriate injector, varying pulse width as required
IPRInjection pressure regulator
The ECM varies the duty cycle of the IPR to control oil pressure and the volume of fuel delivered. 0% full return to sump (open valve), 100% full flow to injectors (closed valve). Functioning is monitored by the Injector pressure control sensor.
IVS Idle validation switch
The IVS is an on-off switch that signals the ECM when the engine is idling. Signal 0V at idle, 12V off-idle
MAPManifold absolute pressure sensor
The MAP measures manifold pressure to limit turbo boost, optimize timing, and reduce over-fueling and smoke. Signal frequency: 111 Hz @ 14.7 psi, 130 Hz @ 20 psi, 167 Hz @ 30 psi.
MIL Malfunction indicator lamp
Check engine or service engine lamp that the ECM illuminates when certain system faults are present. Can also be used to retrieve trouble codes.
PCMPowertrain control module
PCM is the onboard computer that receives sensor inputs, calculates output signals to actuators, and generates diagnostic codes. The computer also controls transmission shift points, anti-skid braking, and other powertrain functions. Referred to in this text as the ECM.
PIDParameter identification
PID, or the data stream, is the sensor data read by scan tools.

Engine Mechanics Problems

SymptomPossible cause
OverheatingClogged, restricted, sealed cooling system
Defective thermostat or shutters
Loss of coolant
Lubrication failureWorn main bearings
Oil pump failure
Engine lugging under load
Extensive idle
Fuel wash on upper-cylinder bores
Water in oil
Low oil Level
Failure pressurize oil system after rebuild
Wrong cylinder finish Low crosshatch finish
Failure to hone after reboring
Insufficient clearance Inadequate bearing clearance at either end of the rod
Improper ring size
Cylinder sleeve distortion

Common Engine Overheating Problems

ProblemPossible Cause
Low coolant levelExternal leaks at hoses, radiator, and radiator cap
Internal leaks at head gasket, cylinder head, aftercooler, torque-converter cooler, etc.
Low heat transferClogged radiator
Scale accumulations in water jacket
Marine growth on keel cooler or insufficient flow of raw water through heat exchanger
Insufficient coolant flowThermostat stuck closed
Loose water-pump belts
Water-pump failurev
Clogged radiator core
Insufficient coolant pressureFailed radiator pressure cap
Failed coolant-pressure relief valve (when fitted)
Coolant overflowCombustion gases entering system-loose or cracked cylinder head, leaks at head gasket, precombustion chamber, cylinder liner
Entrapped air in cooling system
Insufficient air flow throughLow or no fan speed - electric or hydraulic fan drive failure, radiator loose belts, worn pulleys
Fan installed backwards
Shutter not opening
Shrouding not installed properly
High inlet air temperature or restriction Clogged air cleaner
Clogged aftercooler
Turbocharger failure
Exhaust restrictionTurbocharger failure
Water in muffler or loose muffler baffle
Clogged particulate trap/catalytic converter (when fitted)

CAT Engine Fault Codes And Descriptions :

Cat diagnostic code information that follows is utilized by Caterpillar machines that are equipped with Caterpillar electronic controls.Component identifiers, failure mode identifiers, and module identifiers are pieces of information that assist service personnel in diagnosing system problems of the machine.

CAT Fault Codes

Truck resource center for engine faults.

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