Aston Martin diagnostic trouble code
P0116: Engine Coolant Temperature Circuit Range/Performance
Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.
- Code family
- Powertrain
- Vehicle system
- Cooling and temperature
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: MIL; DB9: MIL
What Aston Martin code P0116 means
Engine Coolant Temperature Circuit Range/Performance
DB9 preliminary diagnostic manual · section 2-24
Manufacturer fault-analysis procedure
Manual fault definition
P0116 - The ECT signal fails the rationality check
at key on.
at key on.
Cautions and notes
NOTE: If the engine is started after being off for more
than six hours and the ECT signal indicates more than
50°F above ambient temperature, a P0116 code will be
logged.
than six hours and the ECT signal indicates more than
50°F above ambient temperature, a P0116 code will be
logged.
Test sequence and decision path
1. Connect the WDS or scan tool and confirm that
P0116 is present. If either P0117 or P0118 are
also logged, analyse the problem using the
P0117/0118 procedure.
If only P0116 is logged, go to step 2.
2. Allow the vehicle to cool down for more than six
hours.
3. Switch on the ignition and note the Engine Coolant Temperature and Intake Air Temperature readings.
If coolant temperature is more than 50°F above
Intake Air Temperature, go to step 4.
If Coolant Temperature is less than 50°F above
Intake Air Temperature, the cause is not present at
this time. Analyse the problem as for an intermittent fault.
4. For low voltage readings (high ECT values), suspect a short circuit of the signal (C0636-33) to
ground or to signal return.
Key off, check for short circuit between the lines
from PCM pin C0636-33 to the ECT sensor body
and from pin C0636-33 to power grounds PCM
pins C0635-10, 47, 48 and 49.
If a short circuit is detected, service the wiring as
necessary, clear the P0116 code and run the
engine. Monitor the ECT signal level and check
that it rises normally within the range ‘ambient
temperature to fully warmed up (approx. 95-
98°C)
Table of ECT Sensor Values
Temperature Voltage Resistance
°F °C Volts K Ohms
248 120 0.27 1.18
230 110 0.35 1.55
212 100 0.46 2.07
194 90 0.60 2.80
176 80 0.78 3.84
158 70 1.02 5.37
140 60 1.33 7.70
122 50 1.70 10.97
104 40 2.13 16.15
86 30 2.60 24.27
68 20 3.07 37.30
50 10 3.51 58.75
Open the corresponding manual page for wiring diagrams and figures
P0116 is present. If either P0117 or P0118 are
also logged, analyse the problem using the
P0117/0118 procedure.
If only P0116 is logged, go to step 2.
2. Allow the vehicle to cool down for more than six
hours.
3. Switch on the ignition and note the Engine Coolant Temperature and Intake Air Temperature readings.
If coolant temperature is more than 50°F above
Intake Air Temperature, go to step 4.
If Coolant Temperature is less than 50°F above
Intake Air Temperature, the cause is not present at
this time. Analyse the problem as for an intermittent fault.
4. For low voltage readings (high ECT values), suspect a short circuit of the signal (C0636-33) to
ground or to signal return.
Key off, check for short circuit between the lines
from PCM pin C0636-33 to the ECT sensor body
and from pin C0636-33 to power grounds PCM
pins C0635-10, 47, 48 and 49.
If a short circuit is detected, service the wiring as
necessary, clear the P0116 code and run the
engine. Monitor the ECT signal level and check
that it rises normally within the range ‘ambient
temperature to fully warmed up (approx. 95-
98°C)
Table of ECT Sensor Values
Temperature Voltage Resistance
°F °C Volts K Ohms
248 120 0.27 1.18
230 110 0.35 1.55
212 100 0.46 2.07
194 90 0.60 2.80
176 80 0.78 3.84
158 70 1.02 5.37
140 60 1.33 7.70
122 50 1.70 10.97
104 40 2.13 16.15
86 30 2.60 24.27
68 20 3.07 37.30
50 10 3.51 58.75