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GM Trouble code 12 No Distributor reference pulse?

Stumbling acceleration; No horsepower.

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My 92 4.3 GMC Sonoma idles fine, it became harder to start it used to just tap start, now I have to crank it a few times before it starts, cans hear the cold start silanoide kick in , drives fine from 0 to...


code 12 is no distributor reference pulse
that indicates a crank position sensor problem as the ecm doesn't know where the piston position is for the pulse

Jul 19, 2017 | GMC Cars & Trucks

1 Answer

What does this code mean? No tach signal to ECM - No Distributor Reference Pulses{4}


ISUZU INFORMATION AND LINKS - Front Range 4x4 Forums

www.frontrange4x4.com > Forum > Tech Topics > Make & Model Links
Apr 7, 2008 - 8 posts - ‎2 authors 12 No tach signal to ECM - No Distributor Reference Pulses{4} ... solenoid circuit failure - 1987 and 1995 Amigo/Pick-up, 1989 to 1994 V6 models ... {9}-Amigo, Pickup,Rodeo & Trooper w/2.6L engine & 1988-91 Impulse.

Sep 18, 2015 | 1995 Isuzu Trooper

1 Answer

Code #124155


4.0L
or
5.2L?
where did you see this? 1995 is cusp year before OBD2 tech.
the scan tool shows P0xxx or P1xxx codes. OBD2.
did you leave out spaces???? in the above.
12 = normal or No Reference Pulses to the ECM
41= - No Distributor Reference Signal
55?=Faulty Oxygen Sensor or ECM

12 is normal key on, no start. and bad running. I THINK?
really old car. but the FSM covers this
as does alldata.com


Nov 09, 2013 | 1995 Jeep Grand Cherokee

1 Answer

Trouble code 12 for 1993 chevy silverado


CODE 12 NO ENGINE RPM REFERENCE PULSE SYSTEM NORMAL POSSIBLE CAUSE BAD IGNITION COIL OR BAD IGNITION MODULE IF ENGINE NOT CRANKING GETTING NO SPARK ALSO CHECK IGNITION FUSE MAKE SURE IGNITION COIL GETTING POWER.

Nov 04, 2011 | 1993 Chevrolet C1500

1 Answer

Obd 1 scan on a Saturn 1995 al twin can code 12 what does it mean


GM code 12 is basically no distributor or ignition reference. You will always get that when the engine is not running and you just ignore it.
Are you have an issue with the vehicle? Let me know everything and maybe I can help out.

Oct 14, 2011 | 1995 Saturn Sl

2 Answers

Got trouble codes for 1991 buick century po12 po34 po 45 po 48 wat does that mean and give me the remedial action for that


91 is OBDI not OBDII. The codes are just 12, 34, 45, and 48. 12 - diagnostic mode 34 - MAF/MAP sensor low voltage 45 - Oxygen sensor rich. 48 - not sure on that one What engine do you have? Are there any symptoms? Ill get you some more info once I know what engine.

Sep 26, 2011 | 1991 Buick Century

1 Answer

1997 breeze is shooting codes 12 46 43 55


OBD Code 12 - No Distributor Reference Pulse (Diagnostic Test Active) The Engine Control Module-ECM uses the distributor reference pulse to calculate the engine speed. On newer engines, the Crank Shaft Position Sensor performs this function.

Symptoms:
  • When flashing the Check Engine Light to read codes, code 12 will always display first, indicating the diagnostic system is active
  • The engine will not run with a "hard" code 12 set
Common Problems:
  • Chances are you will never need to diagnose a code 12. Rather, the problem would be a crank, no-start condition.
  • If code 12 does not flash, that would indicate a communication problem with the ECM.
  • Code 12 does not show when reading codes with a scan tool. If there is a communication problem, the scan tool will let you know.



OBD Code 46 - Pass-Key II System Error - Circuit out of Frequency Range The ECM receives a signal from the Pass-Key module. When the correct signal is received, the ECM will allow the engine to start and run. Please review the RepairPal article on the GM Pass-Key Anti-theft systems for more information.

Symptoms:
  • Engine may not start
Common Problems:
  • Faulty ignition lock cylinder



OBD Code 43 - Knock Sensor error The ECM receives a signal from the Knock Sensor based on the amount of engine ping detected. The ECM uses information from this sensor to help calculate fuel delivery and spark timing.

Symptoms:
  • Engine ping
  • Lack of power
Common Problems:
  • Faulty Knock sensor
  • Poor connection at Knock sensor


OBD Code 55 - End Test.


Hope ehit help (remember comment and rated this).

Jul 22, 2010 | 1997 Plymouth Breeze

1 Answer

Car turns over but wont start. I changed the spark plugs and wires, the distributor cap, fuel pump but it still wont start. seems to be getting worse not better.


I REMEMBER WORKING ON THE EARLY 80S MODEL CARS.I WOULD SCAN IT.IF YOU GET CODE 55 YOUR PCM FAULTY.IF YOU GET CODE 12 NO DISTRIBUTOR REFERENCE PULSES TO ECM OR PCM. POSSIBLE CAUSE OPEN IGNITION COIL OR BAD PICK UP COIL OR IGNITION MODULE.

Sep 22, 2009 | 1985 Cadillac Cimarron

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