Mustang 2003 GT - Oil Pressure Switch Failure and (SCP) Data Link Fault

Jackson1992

New Member
Jun 30, 2018
3
0
1
27
Mexico, MO, USA
I have a U1262 (SCP) Data Link Fault and C1284 Oil Pressure Switch Failure. These codes existed since May 29th. My Mustang is stock except for the cold air intake which was installed in 2012 and also added Reverse Glow Gauge which now needs to be replaced since its not glowing anymore. Any help is appreciated. Repair report below.

C1284 Code Definition
Oil Pressure Switch Failure\nNote: This code may not be valid. Re-run the Self-Test with the vehicle running to verify the code.
*3 Frequently Reported Fixes
-Replaced Fuel Pump w/U1043
-Replaced Fuse #34 w/B1681, U1043, U1262
-Replaced Fuse(s) w/B1681, U1043, U1262 (In progress - Replacing all)

U1262 Code Definition
SCP Communication Bus Fault - Perform Network Communications Test
*2 Possible Causes
-Invalid Data: Data transferred in normal inter-module messages with know invalid data. Transmitting module will set the code.
-Missing Network Data: Missing messages fault logged by a module upon failure to receive a message from another module within a defined retry period.
*2 Top Reported Fixes
-Replaced Antilock Brake System (ABS) Control Module
-Replaced Powertrain Control Module (PCM)
*5 Frequently Reported Fixes
-Removed Aftermarket Performance Chip
-Repaired Powertrain Control Module (PCM) Wiring
-Repaired or Replaced Electronic Brake Control Module (EBCM) Connector
-Replaced Instrument Cluster w/U1147
*15 Other Reported Fixes
-Replaced Alternator (Replaced July 2016)
-Replaced Constant Control Relay Module (CCRM) w/ U1147
-Repaired Data Line Wiring w/U1147, U1243
-Replaced Differential Pressure Feedback EGR (DPFE) Sensor w/U1147, U1243
-Repaired Differential Pressure Feedback EGR (DPFE) Sensor Wiring w/U1147
-Tightened Electronic Brake Control Module (EBCM) Connector
-Rehomed Electronic Brake Control Module (EBCM) Connector
-Replaced Fuel Rail Pressure (FRP) Sensor w/ U1147, U1243
-Replaced Fuse #21 w/B1681, P1260, U1043...
-Replaced Fuse #34 w/B1681, C1284,U1043

-Repaired Fuse Box Terminals w/U1147
-Replaced Fuse(s) w/B1681, C1284,U1043 (In progress - Replacing all)
-Repaired Ground G103 w/U1147
-Repaired Ground G104 w/U1147
-Replaced Powertrain Control Module (PCM) Connector(s) w/U1147
 
Last edited:
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Jackson1992

New Member
Jun 30, 2018
3
0
1
27
Mexico, MO, USA
Hello again.

I have a C1225 - Brake Warning Indicator Output Short Circuit To Battery. Last reported June 12th. No further info on how to fix.

Any help appreciated.
 

Jackson1992

New Member
Jun 30, 2018
3
0
1
27
Mexico, MO, USA
I have the following codes:
B2486 - No Code Definition Available (6/13/2018)
B1869 - Lamp Air Bag Warning Indicator Circuit Failure (6/16/2018) - No reported fixes
B1681 - No transceiver signal received from the module/no transceiver detected (6/29/2018) - Read below for reported fixes

The B1681 code appeared after a minor parking lot accident yesterday so I now have a huge impact on my bumper below the left tail light assembly. I also would like to know where the location of the transceiver is.

B1681 Code
*1 Frequently Reported Fix
-Replaced Passive Anti-Theft System (PATS) Transceiver
*7 Other Reported Fixes
-Removed Aftermarket Amplifier Wiring
-Replaced Fuse #21 w/P1260, U1043, U1147...
-Replaced Fuse #34 w/C1284, U1043, U1262
-Replaced Fuse(s) w/C1284, U1043, U1262 (In progress - Replacing All)
-Repaired Passive Anti-Theft System (PATS) Transceiver Wiring w/ P1260
-Replaced Powertrain Control Module (PCM) w/ P1260
-Replaced Transceiver
 
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wmburns

SN Certified Technician
Aug 14, 2009
5,838
505
194
Houston Texas
I would love to help you. The first piece of advice I'm going to give is "stop replacing" parts as a trouble shooting method. Things like changing fuses just don't make sense. Test them.

Test the alternator. Test the battery.

Please re-state the car's current symptoms.

I'm going to assume that the car is a crank with no start. So let's start by CONFIRMING power into some key fuses. Test fuses F2.34, F2.2 and F2.8 for key on power using a known good ground. What to do next depends upon the exact test results.

1999-2004 BJB CJB fuse panel layout:
https://www.allfordmustangs.com/for...r-swap-wont-fire-please-help.html#post2669271

1996+ Crank with no start check list
https://www.allfordmustangs.com/forums/4-6l-tech/336452-1997-mustang-wont-ignite.html

Howto perform charging system voltage drop test
https://www.stangnet.com/mustang-fo...perform-charging-system-voltage-drop-test.56/

OBTW, the code about the oil pressure switch doesn't mean a thing and happens on every car where the motor isn't actually running.
 
Last edited:
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