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Code Meanings
Note:
Remember:
• Code meanings can
vary with vehicle,
model year, engine
type and options.
• If a code number has
more than one
definition listed, note
that that only one
definition applies to
your vehicle. Consult
service manual to get
the specific definition
and troubleshooting
procedure for your
vehicle.
• Follow vehicle service
manual procedures to
find the cause of the
code.
1) Visual inspections are
important!
2) Problems with wiring
and connectors are
common, especially
for intermittent faults.
3) Mechanical problems
(vacuum leaks,
binding or sticking
linkages, etc.) can
make a good sensor
send an incorrect
signal to the computer.
This can cause a
Trouble Code.
4) Incorrect information
from a sensor may
cause the computer to
control the engine in
the wrong way. Faulty
engine operation
could even make a
different good sensor
send an incorrect
signal to the computer
and generate more
trouble codes!
Code lists:
This page: (Codes from
flashing “Check Engine”
light.)
• GM engine codes
• GM electronic
transmission codes
• Saturn engine codes
Page 19 (Codes from
flashing “Shift to D2”
light.)
• Saturn electronic
transmission codes
Refer to Section 4,
“Using Codes” for
troubleshooting tips and
steps to erase codes
from computer memory.
GM/Saturn Engine Codes, GM Transmission Codes
(Saturn transmission code list begins on page 19)
11
14
Transaxle codes present
(Saturn).
Whenever code 11 is sent,
it means transmission
codes will be flashed next
on the “Shift to D2” light.
Refer to page 19 for Saturn
transmission code list.
Coolant temperature
sensor (CTS) - signal
voltage is low.
12
16
Diagnostic test is working
properly. (Engine computer
verifies no RPM Reference
Pulses are present during
engine off testing.)
13
Oxygen (O2) sensor signal stays low (“lean”)
during warm engine cruise
or sensor circuit is open or
left sensor circuit is open
(dual sensor models).
15
Coolant temperature
sensor (CTS) - signal
voltage is high.
Battery or alternator problem
- voltage too high or low.
OR
Direct ignition system
(DIS) fault - line open or
shorted to ground.
OR
Ignition system fault - Loss
of 2X or Low Resolution
Pulse signal.
OR
Transmission speed error.
17
RPM signal problem.
OR
Camshaft sensor - circuit
problems.
OR
Electronic Control Module
(ECM) computer circuit
problem - Pull-up resistor
(Saturn).
18
Camshaft or Crankshaft
sensor - circuit problems.
OR
Fuel Injector circuit is not
working properly - possible
blown fuel injector fuse.
19
Ignition system fault Intermittent 7X signal or
loss of 58X signal or 6X
signal (Saturn).