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Must have Diagnostic Trouble Codes (DTC’s) for 1996 and Newer OBD II Vehicles.
IF I AM NOT A MECHANIC WHY DO I WANT TO READ OR CLEAR DIAGNOSTIC TROUBLE CODES (DTC’S)?
Lets first start this answer by identifying what a DTC’s -Diagnostic Trouble Codes are. DTC’s are codes that identify a problem in a specific system or area and are intended as a guide to diagnose a particular system with use of a vehicle’s service manual. I will emphasize this statement because all too often seasoned mechanics and weekend mechanics alike “ read a code” and “replace a part” without 1st inspecting, testing and diagnosing the system that that part or sensor is controlling.
Do not replace parts or components based only on DTC’s without first consulting the vehicle’s service manual for proper testing procedures for that particular system, circuit or component! The reason is simple, is you have a check engine light on and you are getting a code identifying a 02 sensor failure you might reason to think the 02 sensor has failed correct? Slow down, what if a wire broke causing it to malfunction or a plug corroded causing the resistance of the wiring to increase? Both of these issues might cause the Check engine light to come on and a code to be set for that sensor because the readings are out of range. (Meaning whatever the specification is for that component) Furthermore a mechanical problem can cause a DTC to be set for a code identifying that electrical sensor- knowing how the 02 sensor works, what it does and what can cause engine lean and rich conditions all make big difference if the 02 sensor is “in range”
This write up was not intended to be an overview of what to inspect for a particular sensor or system but an example of why jumping to conclusion of failure can be a costly idea vs. a first time repair.
Back to the question, why do I want to read and clear codes? Think of the things you might do to your Jeep, Dodge or Chrysler that might just set a code off and turn a check engine light on….now think about the time and cost to get to the garage to turn it off when it was not a component failure but a situation that set the code and turned on the light in the 1st place. Wouldn’t it make sense to be able to turn it off?
NOTE : If the code (DTC) was set by a problem that was not resolved before clearing you can bet it will be reset and the light will come back on.
About DTC Codes:
a. Diagnostic trouble codes are alphanumeric codes that are used to identify a problem that is present on any of the systems that are monitored by the on-board computer (PCM-Power train Control Module). (Keyword: systems not component, remember to check the system before replacing a component!)
b. Each trouble code is assigned a description that identifies the circuit, component or system area where the problem was detected.
c. OBD II diagnostic trouble codes are composed of five characters; one letter followed by four digits.
-1st is a letter - it identifies the “main system” where the fault originated (Body, Chassis, Powertrain).
-2nd digit identifies the “type” of code (Generic or Manufacturer Specific).
-3rd digit identifies the specific system or sub-system where the problem is located.
- The 4th and 5th digits identify what section of the system is malfunctioning.
d. There are two types of DTC’s generic codes which are standardized to be used by all vehicle manufacturers. These identify a fault by the same number and definition for all manufactures as set by the Society of Automotive Engineers (SAE).
e. Manufacturer specific DTC’s are codes that are controlled by the vehicle manufacturer. All Manufactures must use the minimal generic codes however manufacturers are free to expand beyond the required computer onboard diagnostics to make their systems easier to diagnose.
ALWAYS Fix known mechanical problems before performing further diagnostics
-Look for loose or damaged hoses, wiring or electrical connectors Which could cause poor engine performance, and may cause a “false” DTC fault code.
-All fluid levels - check the engine, power steering, transmission and coolant..
-Air Intake, Filter Housing and Ducts, check for holes, rips, cracks, plugged filter etc.
-Belts, loose or missing belts.
-Mechanical linkages that are associated with sensors such as throttle, gearshift, transmission.
-Vacuum hoses check for leaks, cracks, blockage or any other damage, and for proper routing.
-Spark plugs and wires for damaged, loose, disconnected or servitor wear.
-Battery, verify proper battery and charging system voltage.
-Verify that the engine is mechanically sound. If necessary, perform a compression check, engine vacuum check, timing check etc.
Plug in your Code Reader or Performance Programmer to retrieve Trouble codes. (Follow manufactures instructions)
I recommend a performance Programmer because you not only have the ability to pull and clear codes but you can also program your vehicle for better performance and horse power! Click HERE for product offerings and FREE Shipping.
Where do I find the Data Link Connector (DLC) to plug in my reader/ programmer?
The Data Link Connecter (DTC) is a sixteen-pin connector which is located under the dash on the driver’s side of the vehicle. The DLC connector should be visible and easily accessible from a kneeling position outside the driver’s side of the vehicle with the driver’s door open.
Plug in your Code Reader or Performance Programmer to retrieve Trouble codes. (Follow manufactures instructions)
GENERIC CODES Downloadable Diagnostic Trouble Codes- DTC’s FREE!
Download complete list of Generic Diagnostic Trouble Codes (DTC'S) above.
Jeep, Chrysler and Dodge Specific codes below. (also included in downloadable list)
MANUFACTURER SPECIFIC CODES – CHRYSLER
P1103 Turbocharger Waste Gate Actuator Malfunction
P1104 Turbocharger Waste Gate Solenoid Malfunction
P1105 Fuel Pressure Solenoid Malfunction
P1195 Slow Switching O2 Sensor Bank One Sensor One During catalyst monitoring
P1196 Slow Switching O2 Sensor Bank two Sensor one During catalyst monitoring
P1197 Slow Switching O2 Sensor Bank One Sensor two During catalyst monitoring
P1198 Radiator Temperature Sensor Input voltage too high
P1199 Radiator Temperature Sensor Input voltage too low
P1281 Engine is cold too long
P1282 Fuel Pump Relay control circuit
P1283 Idle select signal invalid
P1284 Fuel Injection pump battery voltage sensor out of range
P1285 Fuel Injection pump controller always on
P1286 Accelerator Position Sensor (APPS) supply voltage too high
P1287 Fuel Injection pump Controller Supply voltage low
P1288 Intake manifold short runner tuning valve solenoid circuit
P1289 Manifold tune valve solenoid circuit
P1290 CNG Fuel system pressure too high
P1291 No Temp rise seen from intake heaters
P1292 CNG Pressure sensor voltage too high
P1293 CNG Pressure sensor voltage too low
P1294 Target idle not reached
P1295 No 5 volts to MAP sensor
P1297 No change in MAP sensor from start to run
P1298 Lean operation at wide open throttle
P1299 Vacuum Leak detected (IAC fully seated)
P1300 Ignition timing adjustment circuit failure
P1388 Auto shutdown relay control circuit
P1389 No ASD relay output voltage at PCM
P1390 Timing belt skipped one tooth or more
P1391 Intermittent loss of CMP or CKP
P1398 Miss-Fire Adaptive Numerator at Limit (PCM is unable to learn the crank sensors signal for use in preparation for misfire diagnostics)
P1399 Wait to start lamp circuit
P1403 No 5 volt feed to EGR
P1475 Auxiliary 5 volt supply is too high
P1476 Too little secondary air
P1477 Too much secondary air
P1478 Battery Temp Sensor Volts out of limit
P1479 Transmission Fan Relay Circuit
P1480 PCV Solenoid Circuit
P1481 EATX (Electronic Automatic Transaxle) RPM pulse generato performance
P1482 Catalyst Temperature Sensor Circuit shorted low
P1483 Catalyst Temperature Sensor Circuit shorted high
P1484 Catalytic Converter overheat detected
P1485 EVAP Leak Monitor found a pinched hose
P1487 Hi Speed Fan #2 Circuit
P1488 Auxiliary 5 volt supply output is too low
P1489 High speed fan control relay circuit
P1490 Low speed fan control relay circuit
P1491 Radiator fan relay control circuit
P1492 Ambient/ Battery Temp sensor input voltage too high
P1493 Ambient/ Battery Temp sensor input voltage too low
P1494 Leak detection pump pressure switch or mechanical fault
P1495 Leak detection pump solenoid circuit
P1496 5 volt supply, output too low
P1498 High speed radiator fan ground control relay circuit
P1500 General alternator 'FR' Terminal circuit fault
P1594 Charging system voltage too high
P1595 Speed control solenoid circuits
P1596 Speed control switch always high
P1597 Speed control switch always low
P1598 A/C pressure sensor input voltage too high
P1599 A/C pressure sensor input voltage too low
P1680 Clutch released switch circuit
P1681 No I/P Cluster CCD/ J1850 messages received
P1682 Charging system voltage too low
P1683 Speed control servo power control circuit
P1684 The battery has been disconnected within the last 50 starts
P1685 The SKIM (Smart Key Immobilizer Module) has received an invalid key
P1686 No SKIM (Smart Key Immobilizer Module) bus message received
P1687 No Mechanical Instrument cluster bus message
P1688 Internal Fuel injection pump controller failure
P1689 No communication between the ECM and injection pump module
P1690 Fuel injection pump CKP sensor does not agree with the ECM CKP sensor
P1691 Fuel injection pump controller calibration error
P1692 Fault in companion Engine control module
P1693 A companion DTC was set in both the ECM and PCM
P1694 No CCD message from PCM- Aisin transmission
P1695 No CCD message from body control module
P1696 PCM failure EEPROM write denied
P1697 PCM Failure SRI (Service Reminder Indicator) mileage not stored
P1698 No CCD message from TCM
P1719 Skip shift solenoid circuit
P1740 TCC solenoid or overdrive solenoid performance
P1756 Governor pressure not equal to target at 15-20 psi
P1757 Governor pressure is above 3 PSI when 0 PSI is requested
P1762 Governor pressure sensor offset improper voltage
P1763 Governor pressure sensor voltage to high
P1764 Governor pressure sensor voltage to low
P1765 Transmission 12 volt supply relay control circuit
P1899 Park/ Neutral switch stuck in park or gear
Need more information for your Jeep Dodge or Chrysler electrical diagnostics? Click links to read more:
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