LOST JEEPS :: View topic - MIL:OBD code P1261 P1262 P1263 P1264

I have a MIL going on and got my OBD scan and it shows up as P1261 which is defined as:

"P1261: Cyl #1 High to Low Side Short"

But that is not what it is (in fact, that is a code for a gasoline engine.)

I had a P126x code before, last January (2006).

The code it read was "P1263: Cyl #3 High to Low Side Short"

The actual trouble was: "P0672: Cyl #2 Glow Plug Circuit"

So I am going to assume that my current P1261 is actually going to be glow plug related as well - and that is what the dealership currently thinks too - but it has not been in for the official diagnostics yet.

Just an FYI that 1261, 1262, 1263 and 1264 are not actually diesel codes - but are what will show up on most OBDII scanners.

So I am going to assume that my current P1261 is actually going to be glow plug related as well - and that is what the dealership currently thinks too - but it has not been in for the official diagnostics yet.

Missed your earlier data on prior replacement. Sounds like this one will be the final factory gp. Should take care of the gp issue as long as the egr doesn't fail again. If this is only 3 out of 4, it might save another dealer visit to go ahead and replace the last factory gp while their in there working on it. Could be less than the cost of a rental.

Author:	valkraider [ Mon Nov 27, 2006 5:40 pm ]
Post subject:	MIL:OBD code P1261 P1262 P1263 P1264
I have a MIL going on and got my OBD scan and it shows up as P1261 which is defined as: "P1261: Cyl #1 High to Low Side Short" But that is not what it is (in fact, that is a code for a gasoline engine.) I had a P126x code before, last January (2006). The code it read was "P1263: Cyl #3 High to Low Side Short" The actual trouble was: "P0672: Cyl #2 Glow Plug Circuit" So I am going to assume that my current P1261 is actually going to be glow plug related as well - and that is what the dealership currently thinks too - but it has not been in for the official diagnostics yet. Just an FYI that 1261, 1262, 1263 and 1264 are not actually diesel codes - but are what will show up on most OBDII scanners.

Author:	Ranger1 [ Mon Nov 27, 2006 6:16 pm ]
Post subject:	Re: MIL:OBD code P1261 P1262 P1263 P1264
valkraider wrote: I have a MIL going on and got my OBD scan and it shows up as P1261 which is defined as: "P1261: Cyl #1 High to Low Side Short" But that is not what it is (in fact, that is a code for a gasoline engine.) I had a P126x code before, last January (2006). The code it read was "P1263: Cyl #3 High to Low Side Short" The actual trouble was: "P0672: Cyl #2 Glow Plug Circuit" So I am going to assume that my current P1261 is actually going to be glow plug related as well - and that is what the dealership currently thinks too - but it has not been in for the official diagnostics yet. Just an FYI that 1261, 1262, 1263 and 1264 are not actually diesel codes - but are what will show up on most OBDII scanners. You are correct. I had the same issue in August of 2005, a few days after having the first egr replaced, another MIL light occured, along with heavy black smoke, loss of power and a very noisy diesel effect, far more than usual, came with a P1267. The dealer scan tool read that code as 2 codes, P0671 and P0674, bad glow plugs. The tech surmised that driving with a failed egr valve in the open position, as had occured on mine, caused excessive use of the gp's by the PCM, which stressed them prematurely to the point of early failure. He also discovered that the wiring on gp harness had the #1 and #4 gp's switched, which caused him some extra time troubleshooting once he replaced gp #4 and the code was still there. Once he replace both, both codes were cleared, the excessive smoking stopped, and full power was restored. The tech told me that the P1267 was a generic code read by most OBD readers and that the dealer scantool could read the actual codes. I watched them on the dealer scantool and they read correctly. You can check which gp is bad by removing the plastic cover and opening up the connector on the intake tube to the engine (engine off and keys out of the ignition switch). That connector will have 4 unmarked black wires running to the gps behind the intake tube where it meets with the cylinder head. Using an ohmmeter on each of the pins within the connector going to the gp's, the good ones show between .5 and 1.5 ohms to ground. Open or bad gps' show much higher or completely open. Good luck. Let us know how it works out.

Author:	valkraider [ Mon Feb 05, 2007 12:32 pm ]
Post subject:	Just threw a 1267 code.
Hmm. Just threw a 1267 this morning. I am wondering if my glow plugs were damaged before they had the flashes that were to "improve glow plug reliability". This would be my third glow plug if indeed that is what it ends up being... Well, back to the dealer I go.

Author:	valkraider [ Mon Feb 05, 2007 12:34 pm ]
Post subject:	Re: MIL:OBD code P1261 P1262 P1263 P1264
valkraider wrote: So I am going to assume that my current P1261 is actually going to be glow plug related as well - and that is what the dealership currently thinks too - but it has not been in for the official diagnostics yet. Oh, and yeah - it was the glow plug.

Author:	Ranger1 [ Mon Feb 05, 2007 12:55 pm ]
Post subject:
Missed your earlier data on prior replacement. Sounds like this one will be the final factory gp. Should take care of the gp issue as long as the egr doesn't fail again. If this is only 3 out of 4, it might save another dealer visit to go ahead and replace the last factory gp while their in there working on it. Could be less than the cost of a rental.

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Author:	retmil46 [ Mon Feb 05, 2007 1:18 pm ]
Post subject:
Ranger1 wrote: Missed your earlier data on prior replacement. Sounds like this one will be the final factory gp. Should take care of the gp issue as long as the egr doesn't fail again. If this is only 3 out of 4, it might save another dealer visit to go ahead and replace the last factory gp while their in there working on it. Could be less than the cost of a rental. Agreed. Did the same on mine. EGR replacement, then dealer visit for 1st glow plug, when 2nd went out I told them screw it, go ahead and replace the last 3 so we didn't have to go thru this again.

Author:	bigbillyboy [ Thu Jan 10, 2013 1:39 am ]
Post subject:	Re: MIL:OBD code P1261 P1262 P1263 P1264
I know, old post... With a single failed glow plug (1261), could that cause hard starting? I have excessive cranking time (sometimes doesn't start at all) and when it does start, it blows black smoke while revving. FYI (I have lift pump and new filter head, so no air in fuel).

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